//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2023 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
// Automatically generated by generate-swift-syntax
// Do not edit directly!
// swift-format-ignore-file

// MARK: - KeyPathComponentSyntax

/// A single key path component
///
/// ### Children
/// 
///  - `period`: `.`?
///  - `component`: (``KeyPathPropertyComponentSyntax`` | `KeyPathMethodComponentSyntax` | ``KeyPathSubscriptComponentSyntax`` | ``KeyPathOptionalComponentSyntax``)
///
/// ### Contained in
/// 
///  - ``KeyPathComponentListSyntax``
public struct KeyPathComponentSyntax: SyntaxProtocol, SyntaxHashable, _LeafSyntaxNodeProtocol {
  public enum Component: SyntaxChildChoices, SyntaxHashable {
    case property(KeyPathPropertyComponentSyntax)
    /// - Note: Requires experimental feature `keypathWithMethodMembers`.
    @_spi(ExperimentalLanguageFeatures)
    case method(KeyPathMethodComponentSyntax)
    case `subscript`(KeyPathSubscriptComponentSyntax)
    case optional(KeyPathOptionalComponentSyntax)

    public var _syntaxNode: Syntax {
      switch self {
      case .property(let node):
        return node._syntaxNode
      case .method(let node):
        return node._syntaxNode
      case .subscript(let node):
        return node._syntaxNode
      case .optional(let node):
        return node._syntaxNode
      }
    }

    public init(_ node: KeyPathPropertyComponentSyntax) {
      self = .property(node)
    }

    /// - Note: Requires experimental feature `keypathWithMethodMembers`.
    @_spi(ExperimentalLanguageFeatures)
    public init(_ node: KeyPathMethodComponentSyntax) {
      self = .method(node)
    }

    public init(_ node: KeyPathSubscriptComponentSyntax) {
      self = .subscript(node)
    }

    public init(_ node: KeyPathOptionalComponentSyntax) {
      self = .optional(node)
    }

    public init?(_ node: __shared some SyntaxProtocol) {
      if let node = node.as(KeyPathPropertyComponentSyntax.self) {
        self = .property(node)
      } else if let node = node.as(KeyPathMethodComponentSyntax.self) {
        self = .method(node)
      } else if let node = node.as(KeyPathSubscriptComponentSyntax.self) {
        self = .subscript(node)
      } else if let node = node.as(KeyPathOptionalComponentSyntax.self) {
        self = .optional(node)
      } else {
        return nil
      }
    }

    public static var structure: SyntaxNodeStructure {
      return .choices([
        .node(KeyPathPropertyComponentSyntax.self),
        .node(KeyPathMethodComponentSyntax.self),
        .node(KeyPathSubscriptComponentSyntax.self),
        .node(KeyPathOptionalComponentSyntax.self)
      ])
    }

    /// Checks if the current syntax node can be cast to ``KeyPathPropertyComponentSyntax``.
    ///
    /// - Returns: `true` if the node can be cast, `false` otherwise.
    public func `is`(_ syntaxType: KeyPathPropertyComponentSyntax.Type) -> Bool {
      return self.as(syntaxType) != nil
    }

    /// Attempts to cast the current syntax node to ``KeyPathPropertyComponentSyntax``.
    ///
    /// - Returns: An instance of ``KeyPathPropertyComponentSyntax``, or `nil` if the cast fails.
    public func `as`(_ syntaxType: KeyPathPropertyComponentSyntax.Type) -> KeyPathPropertyComponentSyntax? {
      return KeyPathPropertyComponentSyntax.init(self)
    }

    /// Force-casts the current syntax node to ``KeyPathPropertyComponentSyntax``.
    ///
    /// - Returns: An instance of ``KeyPathPropertyComponentSyntax``.
    /// - Warning: This function will crash if the cast is not possible. Use `as` to safely attempt a cast.
    public func cast(_ syntaxType: KeyPathPropertyComponentSyntax.Type) -> KeyPathPropertyComponentSyntax {
      return self.as(KeyPathPropertyComponentSyntax.self)!
    }

    /// Checks if the current syntax node can be cast to `KeyPathMethodComponentSyntax`.
    ///
    /// - Returns: `true` if the node can be cast, `false` otherwise.
    /// - Note: Requires experimental feature `keypathWithMethodMembers`.
    @_spi(ExperimentalLanguageFeatures)
    public func `is`(_ syntaxType: KeyPathMethodComponentSyntax.Type) -> Bool {
      return self.as(syntaxType) != nil
    }

    /// Attempts to cast the current syntax node to `KeyPathMethodComponentSyntax`.
    ///
    /// - Returns: An instance of `KeyPathMethodComponentSyntax`, or `nil` if the cast fails.
    /// - Note: Requires experimental feature `keypathWithMethodMembers`.
    @_spi(ExperimentalLanguageFeatures)
    public func `as`(_ syntaxType: KeyPathMethodComponentSyntax.Type) -> KeyPathMethodComponentSyntax? {
      return KeyPathMethodComponentSyntax.init(self)
    }

    /// Force-casts the current syntax node to `KeyPathMethodComponentSyntax`.
    ///
    /// - Returns: An instance of `KeyPathMethodComponentSyntax`.
    /// - Warning: This function will crash if the cast is not possible. Use `as` to safely attempt a cast.
    /// - Note: Requires experimental feature `keypathWithMethodMembers`.
    @_spi(ExperimentalLanguageFeatures)
    public func cast(_ syntaxType: KeyPathMethodComponentSyntax.Type) -> KeyPathMethodComponentSyntax {
      return self.as(KeyPathMethodComponentSyntax.self)!
    }

    /// Checks if the current syntax node can be cast to ``KeyPathSubscriptComponentSyntax``.
    ///
    /// - Returns: `true` if the node can be cast, `false` otherwise.
    public func `is`(_ syntaxType: KeyPathSubscriptComponentSyntax.Type) -> Bool {
      return self.as(syntaxType) != nil
    }

    /// Attempts to cast the current syntax node to ``KeyPathSubscriptComponentSyntax``.
    ///
    /// - Returns: An instance of ``KeyPathSubscriptComponentSyntax``, or `nil` if the cast fails.
    public func `as`(_ syntaxType: KeyPathSubscriptComponentSyntax.Type) -> KeyPathSubscriptComponentSyntax? {
      return KeyPathSubscriptComponentSyntax.init(self)
    }

    /// Force-casts the current syntax node to ``KeyPathSubscriptComponentSyntax``.
    ///
    /// - Returns: An instance of ``KeyPathSubscriptComponentSyntax``.
    /// - Warning: This function will crash if the cast is not possible. Use `as` to safely attempt a cast.
    public func cast(_ syntaxType: KeyPathSubscriptComponentSyntax.Type) -> KeyPathSubscriptComponentSyntax {
      return self.as(KeyPathSubscriptComponentSyntax.self)!
    }

    /// Checks if the current syntax node can be cast to ``KeyPathOptionalComponentSyntax``.
    ///
    /// - Returns: `true` if the node can be cast, `false` otherwise.
    public func `is`(_ syntaxType: KeyPathOptionalComponentSyntax.Type) -> Bool {
      return self.as(syntaxType) != nil
    }

    /// Attempts to cast the current syntax node to ``KeyPathOptionalComponentSyntax``.
    ///
    /// - Returns: An instance of ``KeyPathOptionalComponentSyntax``, or `nil` if the cast fails.
    public func `as`(_ syntaxType: KeyPathOptionalComponentSyntax.Type) -> KeyPathOptionalComponentSyntax? {
      return KeyPathOptionalComponentSyntax.init(self)
    }

    /// Force-casts the current syntax node to ``KeyPathOptionalComponentSyntax``.
    ///
    /// - Returns: An instance of ``KeyPathOptionalComponentSyntax``.
    /// - Warning: This function will crash if the cast is not possible. Use `as` to safely attempt a cast.
    public func cast(_ syntaxType: KeyPathOptionalComponentSyntax.Type) -> KeyPathOptionalComponentSyntax {
      return self.as(KeyPathOptionalComponentSyntax.self)!
    }
  }

  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .keyPathComponent else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforePeriod: UnexpectedNodesSyntax? = nil,
    period: TokenSyntax? = nil,
    _ unexpectedBetweenPeriodAndComponent: UnexpectedNodesSyntax? = nil,
    component: Component,
    _ unexpectedAfterComponent: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforePeriod,
      period,
      unexpectedBetweenPeriodAndComponent,
      component,
      unexpectedAfterComponent
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforePeriod?.raw,
        period?.raw,
        unexpectedBetweenPeriodAndComponent?.raw,
        component.raw,
        unexpectedAfterComponent?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.keyPathComponent,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforePeriod: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathComponentSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `.`.
  public var period: TokenSyntax? {
    get {
      return Syntax(self).child(at: 1)?.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathComponentSyntax.self)
    }
  }

  public var unexpectedBetweenPeriodAndComponent: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathComponentSyntax.self)
    }
  }

  public var component: Component {
    get {
      return Syntax(self).child(at: 3)!.cast(Component.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathComponentSyntax.self)
    }
  }

  public var unexpectedAfterComponent: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathComponentSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforePeriod,
    \Self.period,
    \Self.unexpectedBetweenPeriodAndComponent,
    \Self.component,
    \Self.unexpectedAfterComponent
  ])
}

// MARK: - KeyPathExprSyntax

/// A key path.
/// 
/// ### Examples
/// 
/// ```swift
/// \a.b[2].a
/// ```
///
/// ### Children
/// 
///  - `backslash`: `\`
///  - `root`: ``TypeSyntax``?
///  - `components`: ``KeyPathComponentListSyntax``
public struct KeyPathExprSyntax: ExprSyntaxProtocol, SyntaxHashable, _LeafExprSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .keyPathExpr else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeBackslash: UnexpectedNodesSyntax? = nil,
    backslash: TokenSyntax = .backslashToken(),
    _ unexpectedBetweenBackslashAndRoot: UnexpectedNodesSyntax? = nil,
    root: (some TypeSyntaxProtocol)? = TypeSyntax?.none,
    _ unexpectedBetweenRootAndComponents: UnexpectedNodesSyntax? = nil,
    components: KeyPathComponentListSyntax,
    _ unexpectedAfterComponents: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeBackslash,
      backslash,
      unexpectedBetweenBackslashAndRoot,
      root,
      unexpectedBetweenRootAndComponents,
      components,
      unexpectedAfterComponents
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeBackslash?.raw,
        backslash.raw,
        unexpectedBetweenBackslashAndRoot?.raw,
        root?.raw,
        unexpectedBetweenRootAndComponents?.raw,
        components.raw,
        unexpectedAfterComponents?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.keyPathExpr,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeBackslash: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathExprSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `\`.
  public var backslash: TokenSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathExprSyntax.self)
    }
  }

  public var unexpectedBetweenBackslashAndRoot: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathExprSyntax.self)
    }
  }

  public var root: TypeSyntax? {
    get {
      return Syntax(self).child(at: 3)?.cast(TypeSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathExprSyntax.self)
    }
  }

  public var unexpectedBetweenRootAndComponents: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathExprSyntax.self)
    }
  }

  public var components: KeyPathComponentListSyntax {
    get {
      return Syntax(self).child(at: 5)!.cast(KeyPathComponentListSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 5, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathExprSyntax.self)
    }
  }

  /// Adds the provided `element` to the node's `components`
  /// collection.
  ///
  /// - param element: The new `KeyPathComponent` to add to the node's
  ///                  `components` collection.
  /// - returns: A copy of the receiver with the provided `KeyPathComponent`
  ///            appended to its `components` collection.
  @available(*, deprecated, message: "Use node.components.append(newElement) instead")
  public func addKeyPathComponent(_ element: KeyPathComponentSyntax) -> KeyPathExprSyntax {
    var collection: RawSyntax
    let arena = RawSyntaxArena()
    if let col = raw.layoutView!.children[5] {
      collection = col.layoutView!.appending(element.raw, arena: arena)
    } else {
      collection = RawSyntax.makeLayout(kind: SyntaxKind.keyPathComponentList,
                                        from: [element.raw], arena: arena)
    }
    return Syntax(self)
      .replacingChild(
        at: 5,
        with: collection,
        rawNodeArena: arena,
        rawAllocationArena: arena
      )
      .cast(KeyPathExprSyntax.self)
  }

  public var unexpectedAfterComponents: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 6)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 6, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathExprSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeBackslash,
    \Self.backslash,
    \Self.unexpectedBetweenBackslashAndRoot,
    \Self.root,
    \Self.unexpectedBetweenRootAndComponents,
    \Self.components,
    \Self.unexpectedAfterComponents
  ])
}

// MARK: - KeyPathMethodComponentSyntax

/// A key path component like `.method()`, `.method(10)`, or `.method(val: 10)`.
///
/// - Note: Requires experimental feature `keypathWithMethodMembers`.
///
/// ### Children
/// 
///  - `declName`: ``DeclReferenceExprSyntax``
///  - `leftParen`: `(`
///  - `arguments`: ``LabeledExprListSyntax``
///  - `rightParen`: `)`
///
/// ### Contained in
/// 
///  - ``KeyPathComponentSyntax``.``KeyPathComponentSyntax/component``
@_spi(ExperimentalLanguageFeatures)
public struct KeyPathMethodComponentSyntax: SyntaxProtocol, SyntaxHashable, _LeafSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .keyPathMethodComponent else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeDeclName: UnexpectedNodesSyntax? = nil,
    declName: DeclReferenceExprSyntax,
    _ unexpectedBetweenDeclNameAndLeftParen: UnexpectedNodesSyntax? = nil,
    leftParen: TokenSyntax = .leftParenToken(),
    _ unexpectedBetweenLeftParenAndArguments: UnexpectedNodesSyntax? = nil,
    arguments: LabeledExprListSyntax,
    _ unexpectedBetweenArgumentsAndRightParen: UnexpectedNodesSyntax? = nil,
    rightParen: TokenSyntax = .rightParenToken(),
    _ unexpectedAfterRightParen: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeDeclName,
      declName,
      unexpectedBetweenDeclNameAndLeftParen,
      leftParen,
      unexpectedBetweenLeftParenAndArguments,
      arguments,
      unexpectedBetweenArgumentsAndRightParen,
      rightParen,
      unexpectedAfterRightParen
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeDeclName?.raw,
        declName.raw,
        unexpectedBetweenDeclNameAndLeftParen?.raw,
        leftParen.raw,
        unexpectedBetweenLeftParenAndArguments?.raw,
        arguments.raw,
        unexpectedBetweenArgumentsAndRightParen?.raw,
        rightParen.raw,
        unexpectedAfterRightParen?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.keyPathMethodComponent,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeDeclName: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathMethodComponentSyntax.self)
    }
  }

  public var declName: DeclReferenceExprSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(DeclReferenceExprSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathMethodComponentSyntax.self)
    }
  }

  public var unexpectedBetweenDeclNameAndLeftParen: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathMethodComponentSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `(`.
  public var leftParen: TokenSyntax {
    get {
      return Syntax(self).child(at: 3)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathMethodComponentSyntax.self)
    }
  }

  public var unexpectedBetweenLeftParenAndArguments: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathMethodComponentSyntax.self)
    }
  }

  public var arguments: LabeledExprListSyntax {
    get {
      return Syntax(self).child(at: 5)!.cast(LabeledExprListSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 5, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathMethodComponentSyntax.self)
    }
  }

  /// Adds the provided `element` to the node's `arguments`
  /// collection.
  ///
  /// - param element: The new `Argument` to add to the node's
  ///                  `arguments` collection.
  /// - returns: A copy of the receiver with the provided `Argument`
  ///            appended to its `arguments` collection.
  @available(*, deprecated, message: "Use node.arguments.append(newElement) instead")
  public func addArgument(_ element: LabeledExprSyntax) -> KeyPathMethodComponentSyntax {
    var collection: RawSyntax
    let arena = RawSyntaxArena()
    if let col = raw.layoutView!.children[5] {
      collection = col.layoutView!.appending(element.raw, arena: arena)
    } else {
      collection = RawSyntax.makeLayout(kind: SyntaxKind.labeledExprList,
                                        from: [element.raw], arena: arena)
    }
    return Syntax(self)
      .replacingChild(
        at: 5,
        with: collection,
        rawNodeArena: arena,
        rawAllocationArena: arena
      )
      .cast(KeyPathMethodComponentSyntax.self)
  }

  public var unexpectedBetweenArgumentsAndRightParen: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 6)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 6, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathMethodComponentSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `)`.
  public var rightParen: TokenSyntax {
    get {
      return Syntax(self).child(at: 7)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 7, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathMethodComponentSyntax.self)
    }
  }

  public var unexpectedAfterRightParen: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 8)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 8, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathMethodComponentSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeDeclName,
    \Self.declName,
    \Self.unexpectedBetweenDeclNameAndLeftParen,
    \Self.leftParen,
    \Self.unexpectedBetweenLeftParenAndArguments,
    \Self.arguments,
    \Self.unexpectedBetweenArgumentsAndRightParen,
    \Self.rightParen,
    \Self.unexpectedAfterRightParen
  ])
}

// MARK: - KeyPathOptionalComponentSyntax

/// A key path component like `?` or `!`.
///
/// ### Children
/// 
///  - `questionOrExclamationMark`: (`?` | `!`)
///
/// ### Contained in
/// 
///  - ``KeyPathComponentSyntax``.``KeyPathComponentSyntax/component``
public struct KeyPathOptionalComponentSyntax: SyntaxProtocol, SyntaxHashable, _LeafSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .keyPathOptionalComponent else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeQuestionOrExclamationMark: UnexpectedNodesSyntax? = nil,
    questionOrExclamationMark: TokenSyntax,
    _ unexpectedAfterQuestionOrExclamationMark: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (unexpectedBeforeQuestionOrExclamationMark, questionOrExclamationMark, unexpectedAfterQuestionOrExclamationMark))) { (arena, _) in
      let layout: [RawSyntax?] = [unexpectedBeforeQuestionOrExclamationMark?.raw, questionOrExclamationMark.raw, unexpectedAfterQuestionOrExclamationMark?.raw]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.keyPathOptionalComponent,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeQuestionOrExclamationMark: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathOptionalComponentSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be one of the following kinds:
  ///  - `?`
  ///  - `!`
  public var questionOrExclamationMark: TokenSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathOptionalComponentSyntax.self)
    }
  }

  public var unexpectedAfterQuestionOrExclamationMark: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathOptionalComponentSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([\Self.unexpectedBeforeQuestionOrExclamationMark, \Self.questionOrExclamationMark, \Self.unexpectedAfterQuestionOrExclamationMark])
}

// MARK: - KeyPathPropertyComponentSyntax

/// A key path component like `.property` or `.1`.
///
/// ### Children
/// 
///  - `declName`: ``DeclReferenceExprSyntax``
///  - `genericArgumentClause`: ``GenericArgumentClauseSyntax``?
///
/// ### Contained in
/// 
///  - ``KeyPathComponentSyntax``.``KeyPathComponentSyntax/component``
public struct KeyPathPropertyComponentSyntax: SyntaxProtocol, SyntaxHashable, _LeafSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .keyPathPropertyComponent else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeDeclName: UnexpectedNodesSyntax? = nil,
    declName: DeclReferenceExprSyntax,
    _ unexpectedBetweenDeclNameAndGenericArgumentClause: UnexpectedNodesSyntax? = nil,
    genericArgumentClause: GenericArgumentClauseSyntax? = nil,
    _ unexpectedAfterGenericArgumentClause: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeDeclName,
      declName,
      unexpectedBetweenDeclNameAndGenericArgumentClause,
      genericArgumentClause,
      unexpectedAfterGenericArgumentClause
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeDeclName?.raw,
        declName.raw,
        unexpectedBetweenDeclNameAndGenericArgumentClause?.raw,
        genericArgumentClause?.raw,
        unexpectedAfterGenericArgumentClause?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.keyPathPropertyComponent,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeDeclName: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathPropertyComponentSyntax.self)
    }
  }

  public var declName: DeclReferenceExprSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(DeclReferenceExprSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathPropertyComponentSyntax.self)
    }
  }

  public var unexpectedBetweenDeclNameAndGenericArgumentClause: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathPropertyComponentSyntax.self)
    }
  }

  public var genericArgumentClause: GenericArgumentClauseSyntax? {
    get {
      return Syntax(self).child(at: 3)?.cast(GenericArgumentClauseSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathPropertyComponentSyntax.self)
    }
  }

  public var unexpectedAfterGenericArgumentClause: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathPropertyComponentSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeDeclName,
    \Self.declName,
    \Self.unexpectedBetweenDeclNameAndGenericArgumentClause,
    \Self.genericArgumentClause,
    \Self.unexpectedAfterGenericArgumentClause
  ])
}

// MARK: - KeyPathSubscriptComponentSyntax

/// A key path component like `.[17]`
///
/// ### Children
/// 
///  - `leftSquare`: `[`
///  - `arguments`: ``LabeledExprListSyntax``
///  - `rightSquare`: `]`
///
/// ### Contained in
/// 
///  - ``KeyPathComponentSyntax``.``KeyPathComponentSyntax/component``
public struct KeyPathSubscriptComponentSyntax: SyntaxProtocol, SyntaxHashable, _LeafSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .keyPathSubscriptComponent else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeLeftSquare: UnexpectedNodesSyntax? = nil,
    leftSquare: TokenSyntax = .leftSquareToken(),
    _ unexpectedBetweenLeftSquareAndArguments: UnexpectedNodesSyntax? = nil,
    arguments: LabeledExprListSyntax,
    _ unexpectedBetweenArgumentsAndRightSquare: UnexpectedNodesSyntax? = nil,
    rightSquare: TokenSyntax = .rightSquareToken(),
    _ unexpectedAfterRightSquare: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeLeftSquare,
      leftSquare,
      unexpectedBetweenLeftSquareAndArguments,
      arguments,
      unexpectedBetweenArgumentsAndRightSquare,
      rightSquare,
      unexpectedAfterRightSquare
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeLeftSquare?.raw,
        leftSquare.raw,
        unexpectedBetweenLeftSquareAndArguments?.raw,
        arguments.raw,
        unexpectedBetweenArgumentsAndRightSquare?.raw,
        rightSquare.raw,
        unexpectedAfterRightSquare?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.keyPathSubscriptComponent,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeLeftSquare: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathSubscriptComponentSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `[`.
  public var leftSquare: TokenSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathSubscriptComponentSyntax.self)
    }
  }

  public var unexpectedBetweenLeftSquareAndArguments: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathSubscriptComponentSyntax.self)
    }
  }

  public var arguments: LabeledExprListSyntax {
    get {
      return Syntax(self).child(at: 3)!.cast(LabeledExprListSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathSubscriptComponentSyntax.self)
    }
  }

  /// Adds the provided `element` to the node's `arguments`
  /// collection.
  ///
  /// - param element: The new `Argument` to add to the node's
  ///                  `arguments` collection.
  /// - returns: A copy of the receiver with the provided `Argument`
  ///            appended to its `arguments` collection.
  @available(*, deprecated, message: "Use node.arguments.append(newElement) instead")
  public func addArgument(_ element: LabeledExprSyntax) -> KeyPathSubscriptComponentSyntax {
    var collection: RawSyntax
    let arena = RawSyntaxArena()
    if let col = raw.layoutView!.children[3] {
      collection = col.layoutView!.appending(element.raw, arena: arena)
    } else {
      collection = RawSyntax.makeLayout(kind: SyntaxKind.labeledExprList,
                                        from: [element.raw], arena: arena)
    }
    return Syntax(self)
      .replacingChild(
        at: 3,
        with: collection,
        rawNodeArena: arena,
        rawAllocationArena: arena
      )
      .cast(KeyPathSubscriptComponentSyntax.self)
  }

  public var unexpectedBetweenArgumentsAndRightSquare: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathSubscriptComponentSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `]`.
  public var rightSquare: TokenSyntax {
    get {
      return Syntax(self).child(at: 5)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 5, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathSubscriptComponentSyntax.self)
    }
  }

  public var unexpectedAfterRightSquare: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 6)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 6, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(KeyPathSubscriptComponentSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeLeftSquare,
    \Self.leftSquare,
    \Self.unexpectedBetweenLeftSquareAndArguments,
    \Self.arguments,
    \Self.unexpectedBetweenArgumentsAndRightSquare,
    \Self.rightSquare,
    \Self.unexpectedAfterRightSquare
  ])
}

// MARK: - LabeledExprSyntax

/// An expression that is prefixed by a label.
/// 
/// For example, labeled expressions occur in
/// - Function calls, where the label is the parameter label.
/// - Tuples, where the label is the name of the tuple element.
///
/// ### Children
/// 
///  - `label`: (`<identifier>` | `_`)?
///  - `colon`: `:`?
///  - `expression`: ``ExprSyntax``
///  - `trailingComma`: `,`?
///
/// ### Contained in
/// 
///  - ``LabeledExprListSyntax``
public struct LabeledExprSyntax: SyntaxProtocol, SyntaxHashable, _LeafSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .labeledExpr else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeLabel: UnexpectedNodesSyntax? = nil,
    label: TokenSyntax? = nil,
    _ unexpectedBetweenLabelAndColon: UnexpectedNodesSyntax? = nil,
    colon: TokenSyntax? = nil,
    _ unexpectedBetweenColonAndExpression: UnexpectedNodesSyntax? = nil,
    expression: some ExprSyntaxProtocol,
    _ unexpectedBetweenExpressionAndTrailingComma: UnexpectedNodesSyntax? = nil,
    trailingComma: TokenSyntax? = nil,
    _ unexpectedAfterTrailingComma: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeLabel,
      label,
      unexpectedBetweenLabelAndColon,
      colon,
      unexpectedBetweenColonAndExpression,
      expression,
      unexpectedBetweenExpressionAndTrailingComma,
      trailingComma,
      unexpectedAfterTrailingComma
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeLabel?.raw,
        label?.raw,
        unexpectedBetweenLabelAndColon?.raw,
        colon?.raw,
        unexpectedBetweenColonAndExpression?.raw,
        expression.raw,
        unexpectedBetweenExpressionAndTrailingComma?.raw,
        trailingComma?.raw,
        unexpectedAfterTrailingComma?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.labeledExpr,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeLabel: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledExprSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be one of the following kinds:
  ///  - `<identifier>`
  ///  - `_`
  public var label: TokenSyntax? {
    get {
      return Syntax(self).child(at: 1)?.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledExprSyntax.self)
    }
  }

  public var unexpectedBetweenLabelAndColon: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledExprSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `:`.
  public var colon: TokenSyntax? {
    get {
      return Syntax(self).child(at: 3)?.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledExprSyntax.self)
    }
  }

  public var unexpectedBetweenColonAndExpression: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledExprSyntax.self)
    }
  }

  public var expression: ExprSyntax {
    get {
      return Syntax(self).child(at: 5)!.cast(ExprSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 5, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledExprSyntax.self)
    }
  }

  public var unexpectedBetweenExpressionAndTrailingComma: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 6)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 6, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledExprSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `,`.
  public var trailingComma: TokenSyntax? {
    get {
      return Syntax(self).child(at: 7)?.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 7, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledExprSyntax.self)
    }
  }

  public var unexpectedAfterTrailingComma: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 8)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 8, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledExprSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeLabel,
    \Self.label,
    \Self.unexpectedBetweenLabelAndColon,
    \Self.colon,
    \Self.unexpectedBetweenColonAndExpression,
    \Self.expression,
    \Self.unexpectedBetweenExpressionAndTrailingComma,
    \Self.trailingComma,
    \Self.unexpectedAfterTrailingComma
  ])
}

// MARK: - LabeledSpecializeArgumentSyntax

/// A labeled argument for the `@_specialize` attribute like `exported: true`
///
/// ### Children
/// 
///  - `label`: (`target` | `availability` | `exported` | `kind` | `spi` | `spiModule`)
///  - `colon`: `:`
///  - `value`: ``TokenSyntax``
///  - `trailingComma`: `,`?
///
/// ### Contained in
/// 
///  - ``SpecializeAttributeArgumentListSyntax``
public struct LabeledSpecializeArgumentSyntax: SyntaxProtocol, SyntaxHashable, _LeafSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .labeledSpecializeArgument else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - label: The label of the argument
  ///   - colon: The colon separating the label and the value
  ///   - value: The value for this argument
  ///   - trailingComma: A trailing comma if this argument is followed by another one
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeLabel: UnexpectedNodesSyntax? = nil,
    label: TokenSyntax,
    _ unexpectedBetweenLabelAndColon: UnexpectedNodesSyntax? = nil,
    colon: TokenSyntax = .colonToken(),
    _ unexpectedBetweenColonAndValue: UnexpectedNodesSyntax? = nil,
    value: TokenSyntax,
    _ unexpectedBetweenValueAndTrailingComma: UnexpectedNodesSyntax? = nil,
    trailingComma: TokenSyntax? = nil,
    _ unexpectedAfterTrailingComma: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeLabel,
      label,
      unexpectedBetweenLabelAndColon,
      colon,
      unexpectedBetweenColonAndValue,
      value,
      unexpectedBetweenValueAndTrailingComma,
      trailingComma,
      unexpectedAfterTrailingComma
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeLabel?.raw,
        label.raw,
        unexpectedBetweenLabelAndColon?.raw,
        colon.raw,
        unexpectedBetweenColonAndValue?.raw,
        value.raw,
        unexpectedBetweenValueAndTrailingComma?.raw,
        trailingComma?.raw,
        unexpectedAfterTrailingComma?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.labeledSpecializeArgument,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeLabel: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledSpecializeArgumentSyntax.self)
    }
  }

  /// The label of the argument
  ///
  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be one of the following kinds:
  ///  - `target`
  ///  - `availability`
  ///  - `exported`
  ///  - `kind`
  ///  - `spi`
  ///  - `spiModule`
  public var label: TokenSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledSpecializeArgumentSyntax.self)
    }
  }

  public var unexpectedBetweenLabelAndColon: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledSpecializeArgumentSyntax.self)
    }
  }

  /// The colon separating the label and the value
  ///
  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `:`.
  public var colon: TokenSyntax {
    get {
      return Syntax(self).child(at: 3)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledSpecializeArgumentSyntax.self)
    }
  }

  public var unexpectedBetweenColonAndValue: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledSpecializeArgumentSyntax.self)
    }
  }

  /// The value for this argument
  public var value: TokenSyntax {
    get {
      return Syntax(self).child(at: 5)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 5, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledSpecializeArgumentSyntax.self)
    }
  }

  public var unexpectedBetweenValueAndTrailingComma: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 6)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 6, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledSpecializeArgumentSyntax.self)
    }
  }

  /// A trailing comma if this argument is followed by another one
  ///
  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `,`.
  public var trailingComma: TokenSyntax? {
    get {
      return Syntax(self).child(at: 7)?.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 7, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledSpecializeArgumentSyntax.self)
    }
  }

  public var unexpectedAfterTrailingComma: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 8)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 8, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledSpecializeArgumentSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeLabel,
    \Self.label,
    \Self.unexpectedBetweenLabelAndColon,
    \Self.colon,
    \Self.unexpectedBetweenColonAndValue,
    \Self.value,
    \Self.unexpectedBetweenValueAndTrailingComma,
    \Self.trailingComma,
    \Self.unexpectedAfterTrailingComma
  ])
}

// MARK: - LabeledStmtSyntax

/// ### Children
/// 
///  - `label`: `<identifier>`
///  - `colon`: `:`
///  - `statement`: ``StmtSyntax``
public struct LabeledStmtSyntax: StmtSyntaxProtocol, SyntaxHashable, _LeafStmtSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .labeledStmt else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeLabel: UnexpectedNodesSyntax? = nil,
    label: TokenSyntax,
    _ unexpectedBetweenLabelAndColon: UnexpectedNodesSyntax? = nil,
    colon: TokenSyntax = .colonToken(),
    _ unexpectedBetweenColonAndStatement: UnexpectedNodesSyntax? = nil,
    statement: some StmtSyntaxProtocol,
    _ unexpectedAfterStatement: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeLabel,
      label,
      unexpectedBetweenLabelAndColon,
      colon,
      unexpectedBetweenColonAndStatement,
      statement,
      unexpectedAfterStatement
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeLabel?.raw,
        label.raw,
        unexpectedBetweenLabelAndColon?.raw,
        colon.raw,
        unexpectedBetweenColonAndStatement?.raw,
        statement.raw,
        unexpectedAfterStatement?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.labeledStmt,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeLabel: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledStmtSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `<identifier>`.
  public var label: TokenSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledStmtSyntax.self)
    }
  }

  public var unexpectedBetweenLabelAndColon: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledStmtSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `:`.
  public var colon: TokenSyntax {
    get {
      return Syntax(self).child(at: 3)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledStmtSyntax.self)
    }
  }

  public var unexpectedBetweenColonAndStatement: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledStmtSyntax.self)
    }
  }

  public var statement: StmtSyntax {
    get {
      return Syntax(self).child(at: 5)!.cast(StmtSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 5, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledStmtSyntax.self)
    }
  }

  public var unexpectedAfterStatement: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 6)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 6, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LabeledStmtSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeLabel,
    \Self.label,
    \Self.unexpectedBetweenLabelAndColon,
    \Self.colon,
    \Self.unexpectedBetweenColonAndStatement,
    \Self.statement,
    \Self.unexpectedAfterStatement
  ])
}

// MARK: - LayoutRequirementSyntax

/// ### Children
/// 
///  - `type`: ``TypeSyntax``
///  - `colon`: `:`
///  - `layoutSpecifier`: (`_Trivial` | `_TrivialAtMost` | `_UnknownLayout` | `_RefCountedObject` | `_NativeRefCountedObject` | `_Class` | `_NativeClass` | `_BridgeObject` | `_TrivialStride`)
///  - `leftParen`: `(`?
///  - `size`: `<integerLiteral>`?
///  - `comma`: `,`?
///  - `alignment`: `<integerLiteral>`?
///  - `rightParen`: `)`?
///
/// ### Contained in
/// 
///  - ``GenericRequirementSyntax``.``GenericRequirementSyntax/requirement``
public struct LayoutRequirementSyntax: SyntaxProtocol, SyntaxHashable, _LeafSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .layoutRequirement else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeType: UnexpectedNodesSyntax? = nil,
    type: some TypeSyntaxProtocol,
    _ unexpectedBetweenTypeAndColon: UnexpectedNodesSyntax? = nil,
    colon: TokenSyntax = .colonToken(),
    _ unexpectedBetweenColonAndLayoutSpecifier: UnexpectedNodesSyntax? = nil,
    layoutSpecifier: TokenSyntax,
    _ unexpectedBetweenLayoutSpecifierAndLeftParen: UnexpectedNodesSyntax? = nil,
    leftParen: TokenSyntax? = nil,
    _ unexpectedBetweenLeftParenAndSize: UnexpectedNodesSyntax? = nil,
    size: TokenSyntax? = nil,
    _ unexpectedBetweenSizeAndComma: UnexpectedNodesSyntax? = nil,
    comma: TokenSyntax? = nil,
    _ unexpectedBetweenCommaAndAlignment: UnexpectedNodesSyntax? = nil,
    alignment: TokenSyntax? = nil,
    _ unexpectedBetweenAlignmentAndRightParen: UnexpectedNodesSyntax? = nil,
    rightParen: TokenSyntax? = nil,
    _ unexpectedAfterRightParen: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeType,
      type,
      unexpectedBetweenTypeAndColon,
      colon,
      unexpectedBetweenColonAndLayoutSpecifier,
      layoutSpecifier,
      unexpectedBetweenLayoutSpecifierAndLeftParen,
      leftParen,
      unexpectedBetweenLeftParenAndSize,
      size,
      unexpectedBetweenSizeAndComma,
      comma,
      unexpectedBetweenCommaAndAlignment,
      alignment,
      unexpectedBetweenAlignmentAndRightParen,
      rightParen,
      unexpectedAfterRightParen
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeType?.raw,
        type.raw,
        unexpectedBetweenTypeAndColon?.raw,
        colon.raw,
        unexpectedBetweenColonAndLayoutSpecifier?.raw,
        layoutSpecifier.raw,
        unexpectedBetweenLayoutSpecifierAndLeftParen?.raw,
        leftParen?.raw,
        unexpectedBetweenLeftParenAndSize?.raw,
        size?.raw,
        unexpectedBetweenSizeAndComma?.raw,
        comma?.raw,
        unexpectedBetweenCommaAndAlignment?.raw,
        alignment?.raw,
        unexpectedBetweenAlignmentAndRightParen?.raw,
        rightParen?.raw,
        unexpectedAfterRightParen?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.layoutRequirement,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeType: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LayoutRequirementSyntax.self)
    }
  }

  public var type: TypeSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TypeSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LayoutRequirementSyntax.self)
    }
  }

  public var unexpectedBetweenTypeAndColon: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LayoutRequirementSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `:`.
  public var colon: TokenSyntax {
    get {
      return Syntax(self).child(at: 3)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LayoutRequirementSyntax.self)
    }
  }

  public var unexpectedBetweenColonAndLayoutSpecifier: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LayoutRequirementSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be one of the following kinds:
  ///  - `_Trivial`
  ///  - `_TrivialAtMost`
  ///  - `_UnknownLayout`
  ///  - `_RefCountedObject`
  ///  - `_NativeRefCountedObject`
  ///  - `_Class`
  ///  - `_NativeClass`
  ///  - `_BridgeObject`
  ///  - `_TrivialStride`
  public var layoutSpecifier: TokenSyntax {
    get {
      return Syntax(self).child(at: 5)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 5, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LayoutRequirementSyntax.self)
    }
  }

  public var unexpectedBetweenLayoutSpecifierAndLeftParen: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 6)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 6, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LayoutRequirementSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `(`.
  public var leftParen: TokenSyntax? {
    get {
      return Syntax(self).child(at: 7)?.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 7, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LayoutRequirementSyntax.self)
    }
  }

  public var unexpectedBetweenLeftParenAndSize: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 8)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 8, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LayoutRequirementSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `<integerLiteral>`.
  public var size: TokenSyntax? {
    get {
      return Syntax(self).child(at: 9)?.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 9, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LayoutRequirementSyntax.self)
    }
  }

  public var unexpectedBetweenSizeAndComma: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 10)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 10, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LayoutRequirementSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `,`.
  public var comma: TokenSyntax? {
    get {
      return Syntax(self).child(at: 11)?.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 11, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LayoutRequirementSyntax.self)
    }
  }

  public var unexpectedBetweenCommaAndAlignment: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 12)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 12, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LayoutRequirementSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `<integerLiteral>`.
  public var alignment: TokenSyntax? {
    get {
      return Syntax(self).child(at: 13)?.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 13, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LayoutRequirementSyntax.self)
    }
  }

  public var unexpectedBetweenAlignmentAndRightParen: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 14)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 14, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LayoutRequirementSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `)`.
  public var rightParen: TokenSyntax? {
    get {
      return Syntax(self).child(at: 15)?.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 15, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LayoutRequirementSyntax.self)
    }
  }

  public var unexpectedAfterRightParen: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 16)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 16, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LayoutRequirementSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeType,
    \Self.type,
    \Self.unexpectedBetweenTypeAndColon,
    \Self.colon,
    \Self.unexpectedBetweenColonAndLayoutSpecifier,
    \Self.layoutSpecifier,
    \Self.unexpectedBetweenLayoutSpecifierAndLeftParen,
    \Self.leftParen,
    \Self.unexpectedBetweenLeftParenAndSize,
    \Self.size,
    \Self.unexpectedBetweenSizeAndComma,
    \Self.comma,
    \Self.unexpectedBetweenCommaAndAlignment,
    \Self.alignment,
    \Self.unexpectedBetweenAlignmentAndRightParen,
    \Self.rightParen,
    \Self.unexpectedAfterRightParen
  ])
}

// MARK: - LifetimeSpecifierArgumentSyntax

/// A single argument that can be added to a lifetime specifier like `borrow`, `mutate`, `consume` or `copy`.
/// 
/// ### Example
/// `data` in `func foo(data: Array<Item>) -> borrow(data) ComplexReferenceType`
///
/// - Note: Requires experimental feature `nonescapableTypes`.
///
/// ### Children
/// 
///  - `parameter`: (`<identifier>` | `self` | `<integerLiteral>`)
///  - `trailingComma`: `,`?
///
/// ### Contained in
/// 
///  - `LifetimeSpecifierArgumentListSyntax`
@_spi(ExperimentalLanguageFeatures)
public struct LifetimeSpecifierArgumentSyntax: SyntaxProtocol, SyntaxHashable, _LeafSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .lifetimeSpecifierArgument else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - parameter: The parameter on which the lifetime of this type depends. 
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeParameter: UnexpectedNodesSyntax? = nil,
    parameter: TokenSyntax,
    _ unexpectedBetweenParameterAndTrailingComma: UnexpectedNodesSyntax? = nil,
    trailingComma: TokenSyntax? = nil,
    _ unexpectedAfterTrailingComma: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeParameter,
      parameter,
      unexpectedBetweenParameterAndTrailingComma,
      trailingComma,
      unexpectedAfterTrailingComma
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeParameter?.raw,
        parameter.raw,
        unexpectedBetweenParameterAndTrailingComma?.raw,
        trailingComma?.raw,
        unexpectedAfterTrailingComma?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.lifetimeSpecifierArgument,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeParameter: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LifetimeSpecifierArgumentSyntax.self)
    }
  }

  /// The parameter on which the lifetime of this type depends. 
  /// 
  /// This can be an identifier referring to an external parameter name, an integer literal to refer to an unnamed
  /// parameter or `self` if the type's lifetime depends on the object the method is called on.
  ///
  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be one of the following kinds:
  ///  - `<identifier>`
  ///  - `self`
  ///  - `<integerLiteral>`
  public var parameter: TokenSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LifetimeSpecifierArgumentSyntax.self)
    }
  }

  public var unexpectedBetweenParameterAndTrailingComma: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LifetimeSpecifierArgumentSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `,`.
  public var trailingComma: TokenSyntax? {
    get {
      return Syntax(self).child(at: 3)?.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LifetimeSpecifierArgumentSyntax.self)
    }
  }

  public var unexpectedAfterTrailingComma: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LifetimeSpecifierArgumentSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeParameter,
    \Self.parameter,
    \Self.unexpectedBetweenParameterAndTrailingComma,
    \Self.trailingComma,
    \Self.unexpectedAfterTrailingComma
  ])
}

// MARK: - LifetimeTypeSpecifierSyntax

/// A specifier that specifies function parameter on whose lifetime a type depends
///
/// - Note: Requires experimental feature `nonescapableTypes`.
///
/// ### Children
/// 
///  - `dependsOnKeyword`: `dependsOn`
///  - `leftParen`: `(`
///  - `scopedKeyword`: `scoped`?
///  - `arguments`: `LifetimeSpecifierArgumentListSyntax`
///  - `rightParen`: `)`
///
/// ### Contained in
/// 
///  - ``TypeSpecifierListSyntax``
@_spi(ExperimentalLanguageFeatures)
public struct LifetimeTypeSpecifierSyntax: SyntaxProtocol, SyntaxHashable, _LeafSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .lifetimeTypeSpecifier else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - dependsOnKeyword: lifetime dependence specifier on the return type
  ///   - scopedKeyword: lifetime of return value is scoped to the lifetime of the original value
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeDependsOnKeyword: UnexpectedNodesSyntax? = nil,
    dependsOnKeyword: TokenSyntax = .keyword(.dependsOn),
    _ unexpectedBetweenDependsOnKeywordAndLeftParen: UnexpectedNodesSyntax? = nil,
    leftParen: TokenSyntax = .leftParenToken(),
    _ unexpectedBetweenLeftParenAndScopedKeyword: UnexpectedNodesSyntax? = nil,
    scopedKeyword: TokenSyntax? = nil,
    _ unexpectedBetweenScopedKeywordAndArguments: UnexpectedNodesSyntax? = nil,
    arguments: LifetimeSpecifierArgumentListSyntax,
    _ unexpectedBetweenArgumentsAndRightParen: UnexpectedNodesSyntax? = nil,
    rightParen: TokenSyntax = .rightParenToken(),
    _ unexpectedAfterRightParen: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeDependsOnKeyword,
      dependsOnKeyword,
      unexpectedBetweenDependsOnKeywordAndLeftParen,
      leftParen,
      unexpectedBetweenLeftParenAndScopedKeyword,
      scopedKeyword,
      unexpectedBetweenScopedKeywordAndArguments,
      arguments,
      unexpectedBetweenArgumentsAndRightParen,
      rightParen,
      unexpectedAfterRightParen
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeDependsOnKeyword?.raw,
        dependsOnKeyword.raw,
        unexpectedBetweenDependsOnKeywordAndLeftParen?.raw,
        leftParen.raw,
        unexpectedBetweenLeftParenAndScopedKeyword?.raw,
        scopedKeyword?.raw,
        unexpectedBetweenScopedKeywordAndArguments?.raw,
        arguments.raw,
        unexpectedBetweenArgumentsAndRightParen?.raw,
        rightParen.raw,
        unexpectedAfterRightParen?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.lifetimeTypeSpecifier,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeDependsOnKeyword: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LifetimeTypeSpecifierSyntax.self)
    }
  }

  /// lifetime dependence specifier on the return type
  ///
  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `dependsOn`.
  public var dependsOnKeyword: TokenSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LifetimeTypeSpecifierSyntax.self)
    }
  }

  public var unexpectedBetweenDependsOnKeywordAndLeftParen: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LifetimeTypeSpecifierSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `(`.
  public var leftParen: TokenSyntax {
    get {
      return Syntax(self).child(at: 3)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LifetimeTypeSpecifierSyntax.self)
    }
  }

  public var unexpectedBetweenLeftParenAndScopedKeyword: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LifetimeTypeSpecifierSyntax.self)
    }
  }

  /// lifetime of return value is scoped to the lifetime of the original value
  ///
  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `scoped`.
  public var scopedKeyword: TokenSyntax? {
    get {
      return Syntax(self).child(at: 5)?.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 5, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LifetimeTypeSpecifierSyntax.self)
    }
  }

  public var unexpectedBetweenScopedKeywordAndArguments: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 6)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 6, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LifetimeTypeSpecifierSyntax.self)
    }
  }

  public var arguments: LifetimeSpecifierArgumentListSyntax {
    get {
      return Syntax(self).child(at: 7)!.cast(LifetimeSpecifierArgumentListSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 7, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LifetimeTypeSpecifierSyntax.self)
    }
  }

  /// Adds the provided `element` to the node's `arguments`
  /// collection.
  ///
  /// - param element: The new `Arguments` to add to the node's
  ///                  `arguments` collection.
  /// - returns: A copy of the receiver with the provided `Arguments`
  ///            appended to its `arguments` collection.
  @available(*, deprecated, message: "Use node.arguments.append(newElement) instead")
  public func addArguments(_ element: LifetimeSpecifierArgumentSyntax) -> LifetimeTypeSpecifierSyntax {
    var collection: RawSyntax
    let arena = RawSyntaxArena()
    if let col = raw.layoutView!.children[7] {
      collection = col.layoutView!.appending(element.raw, arena: arena)
    } else {
      collection = RawSyntax.makeLayout(kind: SyntaxKind.lifetimeSpecifierArgumentList,
                                        from: [element.raw], arena: arena)
    }
    return Syntax(self)
      .replacingChild(
        at: 7,
        with: collection,
        rawNodeArena: arena,
        rawAllocationArena: arena
      )
      .cast(LifetimeTypeSpecifierSyntax.self)
  }

  public var unexpectedBetweenArgumentsAndRightParen: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 8)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 8, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LifetimeTypeSpecifierSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `)`.
  public var rightParen: TokenSyntax {
    get {
      return Syntax(self).child(at: 9)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 9, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LifetimeTypeSpecifierSyntax.self)
    }
  }

  public var unexpectedAfterRightParen: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 10)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 10, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(LifetimeTypeSpecifierSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeDependsOnKeyword,
    \Self.dependsOnKeyword,
    \Self.unexpectedBetweenDependsOnKeywordAndLeftParen,
    \Self.leftParen,
    \Self.unexpectedBetweenLeftParenAndScopedKeyword,
    \Self.scopedKeyword,
    \Self.unexpectedBetweenScopedKeywordAndArguments,
    \Self.arguments,
    \Self.unexpectedBetweenArgumentsAndRightParen,
    \Self.rightParen,
    \Self.unexpectedAfterRightParen
  ])
}

// MARK: - MacroDeclSyntax

/// ### Children
/// 
///  - `attributes`: ``AttributeListSyntax``
///  - `modifiers`: ``DeclModifierListSyntax``
///  - `macroKeyword`: `macro`
///  - `name`: `<identifier>`
///  - `genericParameterClause`: ``GenericParameterClauseSyntax``?
///  - `signature`: ``FunctionSignatureSyntax``
///  - `definition`: ``InitializerClauseSyntax``?
///  - `genericWhereClause`: ``GenericWhereClauseSyntax``?
public struct MacroDeclSyntax: DeclSyntaxProtocol, SyntaxHashable, _LeafDeclSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .macroDecl else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - genericParameterClause: The parameter clause that defines the generic parameters.
  ///   - genericWhereClause: A `where` clause that places additional constraints on generic parameters like `where Element: Hashable`.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeAttributes: UnexpectedNodesSyntax? = nil,
    attributes: AttributeListSyntax = [],
    _ unexpectedBetweenAttributesAndModifiers: UnexpectedNodesSyntax? = nil,
    modifiers: DeclModifierListSyntax = [],
    _ unexpectedBetweenModifiersAndMacroKeyword: UnexpectedNodesSyntax? = nil,
    macroKeyword: TokenSyntax = .keyword(.macro),
    _ unexpectedBetweenMacroKeywordAndName: UnexpectedNodesSyntax? = nil,
    name: TokenSyntax,
    _ unexpectedBetweenNameAndGenericParameterClause: UnexpectedNodesSyntax? = nil,
    genericParameterClause: GenericParameterClauseSyntax? = nil,
    _ unexpectedBetweenGenericParameterClauseAndSignature: UnexpectedNodesSyntax? = nil,
    signature: FunctionSignatureSyntax,
    _ unexpectedBetweenSignatureAndDefinition: UnexpectedNodesSyntax? = nil,
    definition: InitializerClauseSyntax? = nil,
    _ unexpectedBetweenDefinitionAndGenericWhereClause: UnexpectedNodesSyntax? = nil,
    genericWhereClause: GenericWhereClauseSyntax? = nil,
    _ unexpectedAfterGenericWhereClause: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeAttributes,
      attributes,
      unexpectedBetweenAttributesAndModifiers,
      modifiers,
      unexpectedBetweenModifiersAndMacroKeyword,
      macroKeyword,
      unexpectedBetweenMacroKeywordAndName,
      name,
      unexpectedBetweenNameAndGenericParameterClause,
      genericParameterClause,
      unexpectedBetweenGenericParameterClauseAndSignature,
      signature,
      unexpectedBetweenSignatureAndDefinition,
      definition,
      unexpectedBetweenDefinitionAndGenericWhereClause,
      genericWhereClause,
      unexpectedAfterGenericWhereClause
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeAttributes?.raw,
        attributes.raw,
        unexpectedBetweenAttributesAndModifiers?.raw,
        modifiers.raw,
        unexpectedBetweenModifiersAndMacroKeyword?.raw,
        macroKeyword.raw,
        unexpectedBetweenMacroKeywordAndName?.raw,
        name.raw,
        unexpectedBetweenNameAndGenericParameterClause?.raw,
        genericParameterClause?.raw,
        unexpectedBetweenGenericParameterClauseAndSignature?.raw,
        signature.raw,
        unexpectedBetweenSignatureAndDefinition?.raw,
        definition?.raw,
        unexpectedBetweenDefinitionAndGenericWhereClause?.raw,
        genericWhereClause?.raw,
        unexpectedAfterGenericWhereClause?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.macroDecl,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeAttributes: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroDeclSyntax.self)
    }
  }

  public var attributes: AttributeListSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(AttributeListSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroDeclSyntax.self)
    }
  }

  /// Adds the provided `element` to the node's `attributes`
  /// collection.
  ///
  /// - param element: The new `Attribute` to add to the node's
  ///                  `attributes` collection.
  /// - returns: A copy of the receiver with the provided `Attribute`
  ///            appended to its `attributes` collection.
  @available(*, deprecated, message: "Use node.attributes.append(newElement) instead")
  public func addAttribute(_ element: Syntax) -> MacroDeclSyntax {
    var collection: RawSyntax
    let arena = RawSyntaxArena()
    if let col = raw.layoutView!.children[1] {
      collection = col.layoutView!.appending(element.raw, arena: arena)
    } else {
      collection = RawSyntax.makeLayout(kind: SyntaxKind.attributeList,
                                        from: [element.raw], arena: arena)
    }
    return Syntax(self)
      .replacingChild(
        at: 1,
        with: collection,
        rawNodeArena: arena,
        rawAllocationArena: arena
      )
      .cast(MacroDeclSyntax.self)
  }

  public var unexpectedBetweenAttributesAndModifiers: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroDeclSyntax.self)
    }
  }

  public var modifiers: DeclModifierListSyntax {
    get {
      return Syntax(self).child(at: 3)!.cast(DeclModifierListSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroDeclSyntax.self)
    }
  }

  /// Adds the provided `element` to the node's `modifiers`
  /// collection.
  ///
  /// - param element: The new `Modifier` to add to the node's
  ///                  `modifiers` collection.
  /// - returns: A copy of the receiver with the provided `Modifier`
  ///            appended to its `modifiers` collection.
  @available(*, deprecated, message: "Use node.modifiers.append(newElement) instead")
  public func addModifier(_ element: DeclModifierSyntax) -> MacroDeclSyntax {
    var collection: RawSyntax
    let arena = RawSyntaxArena()
    if let col = raw.layoutView!.children[3] {
      collection = col.layoutView!.appending(element.raw, arena: arena)
    } else {
      collection = RawSyntax.makeLayout(kind: SyntaxKind.declModifierList,
                                        from: [element.raw], arena: arena)
    }
    return Syntax(self)
      .replacingChild(
        at: 3,
        with: collection,
        rawNodeArena: arena,
        rawAllocationArena: arena
      )
      .cast(MacroDeclSyntax.self)
  }

  public var unexpectedBetweenModifiersAndMacroKeyword: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroDeclSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `macro`.
  public var macroKeyword: TokenSyntax {
    get {
      return Syntax(self).child(at: 5)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 5, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroDeclSyntax.self)
    }
  }

  public var unexpectedBetweenMacroKeywordAndName: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 6)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 6, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroDeclSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `<identifier>`.
  public var name: TokenSyntax {
    get {
      return Syntax(self).child(at: 7)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 7, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroDeclSyntax.self)
    }
  }

  public var unexpectedBetweenNameAndGenericParameterClause: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 8)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 8, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroDeclSyntax.self)
    }
  }

  /// The parameter clause that defines the generic parameters.
  public var genericParameterClause: GenericParameterClauseSyntax? {
    get {
      return Syntax(self).child(at: 9)?.cast(GenericParameterClauseSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 9, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroDeclSyntax.self)
    }
  }

  public var unexpectedBetweenGenericParameterClauseAndSignature: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 10)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 10, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroDeclSyntax.self)
    }
  }

  public var signature: FunctionSignatureSyntax {
    get {
      return Syntax(self).child(at: 11)!.cast(FunctionSignatureSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 11, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroDeclSyntax.self)
    }
  }

  public var unexpectedBetweenSignatureAndDefinition: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 12)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 12, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroDeclSyntax.self)
    }
  }

  public var definition: InitializerClauseSyntax? {
    get {
      return Syntax(self).child(at: 13)?.cast(InitializerClauseSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 13, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroDeclSyntax.self)
    }
  }

  public var unexpectedBetweenDefinitionAndGenericWhereClause: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 14)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 14, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroDeclSyntax.self)
    }
  }

  /// A `where` clause that places additional constraints on generic parameters like `where Element: Hashable`.
  public var genericWhereClause: GenericWhereClauseSyntax? {
    get {
      return Syntax(self).child(at: 15)?.cast(GenericWhereClauseSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 15, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroDeclSyntax.self)
    }
  }

  public var unexpectedAfterGenericWhereClause: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 16)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 16, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroDeclSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeAttributes,
    \Self.attributes,
    \Self.unexpectedBetweenAttributesAndModifiers,
    \Self.modifiers,
    \Self.unexpectedBetweenModifiersAndMacroKeyword,
    \Self.macroKeyword,
    \Self.unexpectedBetweenMacroKeywordAndName,
    \Self.name,
    \Self.unexpectedBetweenNameAndGenericParameterClause,
    \Self.genericParameterClause,
    \Self.unexpectedBetweenGenericParameterClauseAndSignature,
    \Self.signature,
    \Self.unexpectedBetweenSignatureAndDefinition,
    \Self.definition,
    \Self.unexpectedBetweenDefinitionAndGenericWhereClause,
    \Self.genericWhereClause,
    \Self.unexpectedAfterGenericWhereClause
  ])
}

// MARK: - MacroExpansionDeclSyntax

/// The expansion of a freestanding macro in a position that expects a declaration.
///
/// ### Children
/// 
///  - `attributes`: ``AttributeListSyntax``
///  - `modifiers`: ``DeclModifierListSyntax``
///  - `pound`: `#`
///  - `moduleSelector`: ``ModuleSelectorSyntax``?
///  - `macroName`: `<identifier>`
///  - `genericArgumentClause`: ``GenericArgumentClauseSyntax``?
///  - `leftParen`: `(`?
///  - `arguments`: ``LabeledExprListSyntax``
///  - `rightParen`: `)`?
///  - `trailingClosure`: ``ClosureExprSyntax``?
///  - `additionalTrailingClosures`: ``MultipleTrailingClosureElementListSyntax``
///
/// ### Contained in
/// 
///  - ``SwitchCaseListSyntax``
public struct MacroExpansionDeclSyntax: DeclSyntaxProtocol, SyntaxHashable, _LeafDeclSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .macroExpansionDecl else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - pound: The `#` sign.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeAttributes: UnexpectedNodesSyntax? = nil,
    attributes: AttributeListSyntax = [],
    _ unexpectedBetweenAttributesAndModifiers: UnexpectedNodesSyntax? = nil,
    modifiers: DeclModifierListSyntax = [],
    _ unexpectedBetweenModifiersAndPound: UnexpectedNodesSyntax? = nil,
    pound: TokenSyntax = .poundToken(),
    _ unexpectedBetweenPoundAndModuleSelector: UnexpectedNodesSyntax? = nil,
    moduleSelector: ModuleSelectorSyntax? = nil,
    _ unexpectedBetweenModuleSelectorAndMacroName: UnexpectedNodesSyntax? = nil,
    macroName: TokenSyntax,
    _ unexpectedBetweenMacroNameAndGenericArgumentClause: UnexpectedNodesSyntax? = nil,
    genericArgumentClause: GenericArgumentClauseSyntax? = nil,
    _ unexpectedBetweenGenericArgumentClauseAndLeftParen: UnexpectedNodesSyntax? = nil,
    leftParen: TokenSyntax? = nil,
    _ unexpectedBetweenLeftParenAndArguments: UnexpectedNodesSyntax? = nil,
    arguments: LabeledExprListSyntax,
    _ unexpectedBetweenArgumentsAndRightParen: UnexpectedNodesSyntax? = nil,
    rightParen: TokenSyntax? = nil,
    _ unexpectedBetweenRightParenAndTrailingClosure: UnexpectedNodesSyntax? = nil,
    trailingClosure: ClosureExprSyntax? = nil,
    _ unexpectedBetweenTrailingClosureAndAdditionalTrailingClosures: UnexpectedNodesSyntax? = nil,
    additionalTrailingClosures: MultipleTrailingClosureElementListSyntax = [],
    _ unexpectedAfterAdditionalTrailingClosures: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeAttributes,
      attributes,
      unexpectedBetweenAttributesAndModifiers,
      modifiers,
      unexpectedBetweenModifiersAndPound,
      pound,
      unexpectedBetweenPoundAndModuleSelector,
      moduleSelector,
      unexpectedBetweenModuleSelectorAndMacroName,
      macroName,
      unexpectedBetweenMacroNameAndGenericArgumentClause,
      genericArgumentClause,
      unexpectedBetweenGenericArgumentClauseAndLeftParen,
      leftParen,
      unexpectedBetweenLeftParenAndArguments,
      arguments,
      unexpectedBetweenArgumentsAndRightParen,
      rightParen,
      unexpectedBetweenRightParenAndTrailingClosure,
      trailingClosure,
      unexpectedBetweenTrailingClosureAndAdditionalTrailingClosures,
      additionalTrailingClosures,
      unexpectedAfterAdditionalTrailingClosures
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeAttributes?.raw,
        attributes.raw,
        unexpectedBetweenAttributesAndModifiers?.raw,
        modifiers.raw,
        unexpectedBetweenModifiersAndPound?.raw,
        pound.raw,
        unexpectedBetweenPoundAndModuleSelector?.raw,
        moduleSelector?.raw,
        unexpectedBetweenModuleSelectorAndMacroName?.raw,
        macroName.raw,
        unexpectedBetweenMacroNameAndGenericArgumentClause?.raw,
        genericArgumentClause?.raw,
        unexpectedBetweenGenericArgumentClauseAndLeftParen?.raw,
        leftParen?.raw,
        unexpectedBetweenLeftParenAndArguments?.raw,
        arguments.raw,
        unexpectedBetweenArgumentsAndRightParen?.raw,
        rightParen?.raw,
        unexpectedBetweenRightParenAndTrailingClosure?.raw,
        trailingClosure?.raw,
        unexpectedBetweenTrailingClosureAndAdditionalTrailingClosures?.raw,
        additionalTrailingClosures.raw,
        unexpectedAfterAdditionalTrailingClosures?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.macroExpansionDecl,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeAttributes: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  public var attributes: AttributeListSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(AttributeListSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  /// Adds the provided `element` to the node's `attributes`
  /// collection.
  ///
  /// - param element: The new `Attribute` to add to the node's
  ///                  `attributes` collection.
  /// - returns: A copy of the receiver with the provided `Attribute`
  ///            appended to its `attributes` collection.
  @available(*, deprecated, message: "Use node.attributes.append(newElement) instead")
  public func addAttribute(_ element: Syntax) -> MacroExpansionDeclSyntax {
    var collection: RawSyntax
    let arena = RawSyntaxArena()
    if let col = raw.layoutView!.children[1] {
      collection = col.layoutView!.appending(element.raw, arena: arena)
    } else {
      collection = RawSyntax.makeLayout(kind: SyntaxKind.attributeList,
                                        from: [element.raw], arena: arena)
    }
    return Syntax(self)
      .replacingChild(
        at: 1,
        with: collection,
        rawNodeArena: arena,
        rawAllocationArena: arena
      )
      .cast(MacroExpansionDeclSyntax.self)
  }

  public var unexpectedBetweenAttributesAndModifiers: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  public var modifiers: DeclModifierListSyntax {
    get {
      return Syntax(self).child(at: 3)!.cast(DeclModifierListSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  /// Adds the provided `element` to the node's `modifiers`
  /// collection.
  ///
  /// - param element: The new `Modifier` to add to the node's
  ///                  `modifiers` collection.
  /// - returns: A copy of the receiver with the provided `Modifier`
  ///            appended to its `modifiers` collection.
  @available(*, deprecated, message: "Use node.modifiers.append(newElement) instead")
  public func addModifier(_ element: DeclModifierSyntax) -> MacroExpansionDeclSyntax {
    var collection: RawSyntax
    let arena = RawSyntaxArena()
    if let col = raw.layoutView!.children[3] {
      collection = col.layoutView!.appending(element.raw, arena: arena)
    } else {
      collection = RawSyntax.makeLayout(kind: SyntaxKind.declModifierList,
                                        from: [element.raw], arena: arena)
    }
    return Syntax(self)
      .replacingChild(
        at: 3,
        with: collection,
        rawNodeArena: arena,
        rawAllocationArena: arena
      )
      .cast(MacroExpansionDeclSyntax.self)
  }

  public var unexpectedBetweenModifiersAndPound: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  /// The `#` sign.
  ///
  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `#`.
  public var pound: TokenSyntax {
    get {
      return Syntax(self).child(at: 5)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 5, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  public var unexpectedBetweenPoundAndModuleSelector: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 6)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 6, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  public var moduleSelector: ModuleSelectorSyntax? {
    get {
      return Syntax(self).child(at: 7)?.cast(ModuleSelectorSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 7, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  public var unexpectedBetweenModuleSelectorAndMacroName: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 8)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 8, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `<identifier>`.
  public var macroName: TokenSyntax {
    get {
      return Syntax(self).child(at: 9)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 9, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  public var unexpectedBetweenMacroNameAndGenericArgumentClause: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 10)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 10, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  public var genericArgumentClause: GenericArgumentClauseSyntax? {
    get {
      return Syntax(self).child(at: 11)?.cast(GenericArgumentClauseSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 11, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  public var unexpectedBetweenGenericArgumentClauseAndLeftParen: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 12)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 12, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `(`.
  public var leftParen: TokenSyntax? {
    get {
      return Syntax(self).child(at: 13)?.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 13, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  public var unexpectedBetweenLeftParenAndArguments: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 14)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 14, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  public var arguments: LabeledExprListSyntax {
    get {
      return Syntax(self).child(at: 15)!.cast(LabeledExprListSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 15, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  /// Adds the provided `element` to the node's `arguments`
  /// collection.
  ///
  /// - param element: The new `Argument` to add to the node's
  ///                  `arguments` collection.
  /// - returns: A copy of the receiver with the provided `Argument`
  ///            appended to its `arguments` collection.
  @available(*, deprecated, message: "Use node.arguments.append(newElement) instead")
  public func addArgument(_ element: LabeledExprSyntax) -> MacroExpansionDeclSyntax {
    var collection: RawSyntax
    let arena = RawSyntaxArena()
    if let col = raw.layoutView!.children[15] {
      collection = col.layoutView!.appending(element.raw, arena: arena)
    } else {
      collection = RawSyntax.makeLayout(kind: SyntaxKind.labeledExprList,
                                        from: [element.raw], arena: arena)
    }
    return Syntax(self)
      .replacingChild(
        at: 15,
        with: collection,
        rawNodeArena: arena,
        rawAllocationArena: arena
      )
      .cast(MacroExpansionDeclSyntax.self)
  }

  public var unexpectedBetweenArgumentsAndRightParen: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 16)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 16, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `)`.
  public var rightParen: TokenSyntax? {
    get {
      return Syntax(self).child(at: 17)?.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 17, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  public var unexpectedBetweenRightParenAndTrailingClosure: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 18)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 18, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  public var trailingClosure: ClosureExprSyntax? {
    get {
      return Syntax(self).child(at: 19)?.cast(ClosureExprSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 19, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  public var unexpectedBetweenTrailingClosureAndAdditionalTrailingClosures: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 20)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 20, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  public var additionalTrailingClosures: MultipleTrailingClosureElementListSyntax {
    get {
      return Syntax(self).child(at: 21)!.cast(MultipleTrailingClosureElementListSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 21, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  /// Adds the provided `element` to the node's `additionalTrailingClosures`
  /// collection.
  ///
  /// - param element: The new `AdditionalTrailingClosure` to add to the node's
  ///                  `additionalTrailingClosures` collection.
  /// - returns: A copy of the receiver with the provided `AdditionalTrailingClosure`
  ///            appended to its `additionalTrailingClosures` collection.
  @available(*, deprecated, message: "Use node.additionalTrailingClosures.append(newElement) instead")
  public func addAdditionalTrailingClosure(_ element: MultipleTrailingClosureElementSyntax) -> MacroExpansionDeclSyntax {
    var collection: RawSyntax
    let arena = RawSyntaxArena()
    if let col = raw.layoutView!.children[21] {
      collection = col.layoutView!.appending(element.raw, arena: arena)
    } else {
      collection = RawSyntax.makeLayout(kind: SyntaxKind.multipleTrailingClosureElementList,
                                        from: [element.raw], arena: arena)
    }
    return Syntax(self)
      .replacingChild(
        at: 21,
        with: collection,
        rawNodeArena: arena,
        rawAllocationArena: arena
      )
      .cast(MacroExpansionDeclSyntax.self)
  }

  public var unexpectedAfterAdditionalTrailingClosures: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 22)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 22, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionDeclSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeAttributes,
    \Self.attributes,
    \Self.unexpectedBetweenAttributesAndModifiers,
    \Self.modifiers,
    \Self.unexpectedBetweenModifiersAndPound,
    \Self.pound,
    \Self.unexpectedBetweenPoundAndModuleSelector,
    \Self.moduleSelector,
    \Self.unexpectedBetweenModuleSelectorAndMacroName,
    \Self.macroName,
    \Self.unexpectedBetweenMacroNameAndGenericArgumentClause,
    \Self.genericArgumentClause,
    \Self.unexpectedBetweenGenericArgumentClauseAndLeftParen,
    \Self.leftParen,
    \Self.unexpectedBetweenLeftParenAndArguments,
    \Self.arguments,
    \Self.unexpectedBetweenArgumentsAndRightParen,
    \Self.rightParen,
    \Self.unexpectedBetweenRightParenAndTrailingClosure,
    \Self.trailingClosure,
    \Self.unexpectedBetweenTrailingClosureAndAdditionalTrailingClosures,
    \Self.additionalTrailingClosures,
    \Self.unexpectedAfterAdditionalTrailingClosures
  ])
}

// MARK: - MacroExpansionExprSyntax

/// The expansion of a freestanding macro in a position that expects an expression.
///
/// ### Children
/// 
///  - `pound`: `#`
///  - `moduleSelector`: ``ModuleSelectorSyntax``?
///  - `macroName`: `<identifier>`
///  - `genericArgumentClause`: ``GenericArgumentClauseSyntax``?
///  - `leftParen`: `(`?
///  - `arguments`: ``LabeledExprListSyntax``
///  - `rightParen`: `)`?
///  - `trailingClosure`: ``ClosureExprSyntax``?
///  - `additionalTrailingClosures`: ``MultipleTrailingClosureElementListSyntax``
public struct MacroExpansionExprSyntax: ExprSyntaxProtocol, SyntaxHashable, _LeafExprSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .macroExpansionExpr else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - pound: The `#` sign.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforePound: UnexpectedNodesSyntax? = nil,
    pound: TokenSyntax = .poundToken(),
    _ unexpectedBetweenPoundAndModuleSelector: UnexpectedNodesSyntax? = nil,
    moduleSelector: ModuleSelectorSyntax? = nil,
    _ unexpectedBetweenModuleSelectorAndMacroName: UnexpectedNodesSyntax? = nil,
    macroName: TokenSyntax,
    _ unexpectedBetweenMacroNameAndGenericArgumentClause: UnexpectedNodesSyntax? = nil,
    genericArgumentClause: GenericArgumentClauseSyntax? = nil,
    _ unexpectedBetweenGenericArgumentClauseAndLeftParen: UnexpectedNodesSyntax? = nil,
    leftParen: TokenSyntax? = nil,
    _ unexpectedBetweenLeftParenAndArguments: UnexpectedNodesSyntax? = nil,
    arguments: LabeledExprListSyntax,
    _ unexpectedBetweenArgumentsAndRightParen: UnexpectedNodesSyntax? = nil,
    rightParen: TokenSyntax? = nil,
    _ unexpectedBetweenRightParenAndTrailingClosure: UnexpectedNodesSyntax? = nil,
    trailingClosure: ClosureExprSyntax? = nil,
    _ unexpectedBetweenTrailingClosureAndAdditionalTrailingClosures: UnexpectedNodesSyntax? = nil,
    additionalTrailingClosures: MultipleTrailingClosureElementListSyntax = [],
    _ unexpectedAfterAdditionalTrailingClosures: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforePound,
      pound,
      unexpectedBetweenPoundAndModuleSelector,
      moduleSelector,
      unexpectedBetweenModuleSelectorAndMacroName,
      macroName,
      unexpectedBetweenMacroNameAndGenericArgumentClause,
      genericArgumentClause,
      unexpectedBetweenGenericArgumentClauseAndLeftParen,
      leftParen,
      unexpectedBetweenLeftParenAndArguments,
      arguments,
      unexpectedBetweenArgumentsAndRightParen,
      rightParen,
      unexpectedBetweenRightParenAndTrailingClosure,
      trailingClosure,
      unexpectedBetweenTrailingClosureAndAdditionalTrailingClosures,
      additionalTrailingClosures,
      unexpectedAfterAdditionalTrailingClosures
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforePound?.raw,
        pound.raw,
        unexpectedBetweenPoundAndModuleSelector?.raw,
        moduleSelector?.raw,
        unexpectedBetweenModuleSelectorAndMacroName?.raw,
        macroName.raw,
        unexpectedBetweenMacroNameAndGenericArgumentClause?.raw,
        genericArgumentClause?.raw,
        unexpectedBetweenGenericArgumentClauseAndLeftParen?.raw,
        leftParen?.raw,
        unexpectedBetweenLeftParenAndArguments?.raw,
        arguments.raw,
        unexpectedBetweenArgumentsAndRightParen?.raw,
        rightParen?.raw,
        unexpectedBetweenRightParenAndTrailingClosure?.raw,
        trailingClosure?.raw,
        unexpectedBetweenTrailingClosureAndAdditionalTrailingClosures?.raw,
        additionalTrailingClosures.raw,
        unexpectedAfterAdditionalTrailingClosures?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.macroExpansionExpr,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforePound: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionExprSyntax.self)
    }
  }

  /// The `#` sign.
  ///
  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `#`.
  public var pound: TokenSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionExprSyntax.self)
    }
  }

  public var unexpectedBetweenPoundAndModuleSelector: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionExprSyntax.self)
    }
  }

  public var moduleSelector: ModuleSelectorSyntax? {
    get {
      return Syntax(self).child(at: 3)?.cast(ModuleSelectorSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionExprSyntax.self)
    }
  }

  public var unexpectedBetweenModuleSelectorAndMacroName: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionExprSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `<identifier>`.
  public var macroName: TokenSyntax {
    get {
      return Syntax(self).child(at: 5)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 5, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionExprSyntax.self)
    }
  }

  public var unexpectedBetweenMacroNameAndGenericArgumentClause: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 6)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 6, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionExprSyntax.self)
    }
  }

  public var genericArgumentClause: GenericArgumentClauseSyntax? {
    get {
      return Syntax(self).child(at: 7)?.cast(GenericArgumentClauseSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 7, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionExprSyntax.self)
    }
  }

  public var unexpectedBetweenGenericArgumentClauseAndLeftParen: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 8)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 8, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionExprSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `(`.
  public var leftParen: TokenSyntax? {
    get {
      return Syntax(self).child(at: 9)?.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 9, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionExprSyntax.self)
    }
  }

  public var unexpectedBetweenLeftParenAndArguments: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 10)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 10, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionExprSyntax.self)
    }
  }

  public var arguments: LabeledExprListSyntax {
    get {
      return Syntax(self).child(at: 11)!.cast(LabeledExprListSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 11, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionExprSyntax.self)
    }
  }

  /// Adds the provided `element` to the node's `arguments`
  /// collection.
  ///
  /// - param element: The new `Argument` to add to the node's
  ///                  `arguments` collection.
  /// - returns: A copy of the receiver with the provided `Argument`
  ///            appended to its `arguments` collection.
  @available(*, deprecated, message: "Use node.arguments.append(newElement) instead")
  public func addArgument(_ element: LabeledExprSyntax) -> MacroExpansionExprSyntax {
    var collection: RawSyntax
    let arena = RawSyntaxArena()
    if let col = raw.layoutView!.children[11] {
      collection = col.layoutView!.appending(element.raw, arena: arena)
    } else {
      collection = RawSyntax.makeLayout(kind: SyntaxKind.labeledExprList,
                                        from: [element.raw], arena: arena)
    }
    return Syntax(self)
      .replacingChild(
        at: 11,
        with: collection,
        rawNodeArena: arena,
        rawAllocationArena: arena
      )
      .cast(MacroExpansionExprSyntax.self)
  }

  public var unexpectedBetweenArgumentsAndRightParen: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 12)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 12, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionExprSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `)`.
  public var rightParen: TokenSyntax? {
    get {
      return Syntax(self).child(at: 13)?.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 13, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionExprSyntax.self)
    }
  }

  public var unexpectedBetweenRightParenAndTrailingClosure: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 14)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 14, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionExprSyntax.self)
    }
  }

  public var trailingClosure: ClosureExprSyntax? {
    get {
      return Syntax(self).child(at: 15)?.cast(ClosureExprSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 15, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionExprSyntax.self)
    }
  }

  public var unexpectedBetweenTrailingClosureAndAdditionalTrailingClosures: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 16)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 16, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionExprSyntax.self)
    }
  }

  public var additionalTrailingClosures: MultipleTrailingClosureElementListSyntax {
    get {
      return Syntax(self).child(at: 17)!.cast(MultipleTrailingClosureElementListSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 17, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionExprSyntax.self)
    }
  }

  /// Adds the provided `element` to the node's `additionalTrailingClosures`
  /// collection.
  ///
  /// - param element: The new `AdditionalTrailingClosure` to add to the node's
  ///                  `additionalTrailingClosures` collection.
  /// - returns: A copy of the receiver with the provided `AdditionalTrailingClosure`
  ///            appended to its `additionalTrailingClosures` collection.
  @available(*, deprecated, message: "Use node.additionalTrailingClosures.append(newElement) instead")
  public func addAdditionalTrailingClosure(_ element: MultipleTrailingClosureElementSyntax) -> MacroExpansionExprSyntax {
    var collection: RawSyntax
    let arena = RawSyntaxArena()
    if let col = raw.layoutView!.children[17] {
      collection = col.layoutView!.appending(element.raw, arena: arena)
    } else {
      collection = RawSyntax.makeLayout(kind: SyntaxKind.multipleTrailingClosureElementList,
                                        from: [element.raw], arena: arena)
    }
    return Syntax(self)
      .replacingChild(
        at: 17,
        with: collection,
        rawNodeArena: arena,
        rawAllocationArena: arena
      )
      .cast(MacroExpansionExprSyntax.self)
  }

  public var unexpectedAfterAdditionalTrailingClosures: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 18)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 18, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MacroExpansionExprSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforePound,
    \Self.pound,
    \Self.unexpectedBetweenPoundAndModuleSelector,
    \Self.moduleSelector,
    \Self.unexpectedBetweenModuleSelectorAndMacroName,
    \Self.macroName,
    \Self.unexpectedBetweenMacroNameAndGenericArgumentClause,
    \Self.genericArgumentClause,
    \Self.unexpectedBetweenGenericArgumentClauseAndLeftParen,
    \Self.leftParen,
    \Self.unexpectedBetweenLeftParenAndArguments,
    \Self.arguments,
    \Self.unexpectedBetweenArgumentsAndRightParen,
    \Self.rightParen,
    \Self.unexpectedBetweenRightParenAndTrailingClosure,
    \Self.trailingClosure,
    \Self.unexpectedBetweenTrailingClosureAndAdditionalTrailingClosures,
    \Self.additionalTrailingClosures,
    \Self.unexpectedAfterAdditionalTrailingClosures
  ])
}

// MARK: - MatchingPatternConditionSyntax

/// ### Children
/// 
///  - `caseKeyword`: `case`
///  - `pattern`: ``PatternSyntax``
///  - `typeAnnotation`: ``TypeAnnotationSyntax``?
///  - `initializer`: ``InitializerClauseSyntax``
///
/// ### Contained in
/// 
///  - ``ConditionElementSyntax``.``ConditionElementSyntax/condition``
public struct MatchingPatternConditionSyntax: SyntaxProtocol, SyntaxHashable, _LeafSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .matchingPatternCondition else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeCaseKeyword: UnexpectedNodesSyntax? = nil,
    caseKeyword: TokenSyntax = .keyword(.case),
    _ unexpectedBetweenCaseKeywordAndPattern: UnexpectedNodesSyntax? = nil,
    pattern: some PatternSyntaxProtocol,
    _ unexpectedBetweenPatternAndTypeAnnotation: UnexpectedNodesSyntax? = nil,
    typeAnnotation: TypeAnnotationSyntax? = nil,
    _ unexpectedBetweenTypeAnnotationAndInitializer: UnexpectedNodesSyntax? = nil,
    initializer: InitializerClauseSyntax,
    _ unexpectedAfterInitializer: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeCaseKeyword,
      caseKeyword,
      unexpectedBetweenCaseKeywordAndPattern,
      pattern,
      unexpectedBetweenPatternAndTypeAnnotation,
      typeAnnotation,
      unexpectedBetweenTypeAnnotationAndInitializer,
      initializer,
      unexpectedAfterInitializer
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeCaseKeyword?.raw,
        caseKeyword.raw,
        unexpectedBetweenCaseKeywordAndPattern?.raw,
        pattern.raw,
        unexpectedBetweenPatternAndTypeAnnotation?.raw,
        typeAnnotation?.raw,
        unexpectedBetweenTypeAnnotationAndInitializer?.raw,
        initializer.raw,
        unexpectedAfterInitializer?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.matchingPatternCondition,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeCaseKeyword: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MatchingPatternConditionSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `case`.
  public var caseKeyword: TokenSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MatchingPatternConditionSyntax.self)
    }
  }

  public var unexpectedBetweenCaseKeywordAndPattern: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MatchingPatternConditionSyntax.self)
    }
  }

  public var pattern: PatternSyntax {
    get {
      return Syntax(self).child(at: 3)!.cast(PatternSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MatchingPatternConditionSyntax.self)
    }
  }

  public var unexpectedBetweenPatternAndTypeAnnotation: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MatchingPatternConditionSyntax.self)
    }
  }

  public var typeAnnotation: TypeAnnotationSyntax? {
    get {
      return Syntax(self).child(at: 5)?.cast(TypeAnnotationSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 5, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MatchingPatternConditionSyntax.self)
    }
  }

  public var unexpectedBetweenTypeAnnotationAndInitializer: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 6)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 6, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MatchingPatternConditionSyntax.self)
    }
  }

  public var initializer: InitializerClauseSyntax {
    get {
      return Syntax(self).child(at: 7)!.cast(InitializerClauseSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 7, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MatchingPatternConditionSyntax.self)
    }
  }

  public var unexpectedAfterInitializer: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 8)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 8, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MatchingPatternConditionSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeCaseKeyword,
    \Self.caseKeyword,
    \Self.unexpectedBetweenCaseKeywordAndPattern,
    \Self.pattern,
    \Self.unexpectedBetweenPatternAndTypeAnnotation,
    \Self.typeAnnotation,
    \Self.unexpectedBetweenTypeAnnotationAndInitializer,
    \Self.initializer,
    \Self.unexpectedAfterInitializer
  ])
}

// MARK: - MemberAccessExprSyntax

/// An expression that access a member like a function or a property.
///
/// ### Children
/// 
///  - `base`: ``ExprSyntax``?
///  - `period`: `.`
///  - `declName`: ``DeclReferenceExprSyntax``
public struct MemberAccessExprSyntax: ExprSyntaxProtocol, SyntaxHashable, _LeafExprSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .memberAccessExpr else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - base: The base of the member access, optionally specified.
  ///   - declName: The name of the referenced function or a property.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeBase: UnexpectedNodesSyntax? = nil,
    base: (some ExprSyntaxProtocol)? = ExprSyntax?.none,
    _ unexpectedBetweenBaseAndPeriod: UnexpectedNodesSyntax? = nil,
    period: TokenSyntax = .periodToken(),
    _ unexpectedBetweenPeriodAndDeclName: UnexpectedNodesSyntax? = nil,
    declName: DeclReferenceExprSyntax,
    _ unexpectedAfterDeclName: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeBase,
      base,
      unexpectedBetweenBaseAndPeriod,
      period,
      unexpectedBetweenPeriodAndDeclName,
      declName,
      unexpectedAfterDeclName
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeBase?.raw,
        base?.raw,
        unexpectedBetweenBaseAndPeriod?.raw,
        period.raw,
        unexpectedBetweenPeriodAndDeclName?.raw,
        declName.raw,
        unexpectedAfterDeclName?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.memberAccessExpr,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeBase: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberAccessExprSyntax.self)
    }
  }

  /// The base of the member access, optionally specified.
  public var base: ExprSyntax? {
    get {
      return Syntax(self).child(at: 1)?.cast(ExprSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberAccessExprSyntax.self)
    }
  }

  public var unexpectedBetweenBaseAndPeriod: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberAccessExprSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `.`.
  public var period: TokenSyntax {
    get {
      return Syntax(self).child(at: 3)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberAccessExprSyntax.self)
    }
  }

  public var unexpectedBetweenPeriodAndDeclName: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberAccessExprSyntax.self)
    }
  }

  /// The name of the referenced function or a property.
  public var declName: DeclReferenceExprSyntax {
    get {
      return Syntax(self).child(at: 5)!.cast(DeclReferenceExprSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 5, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberAccessExprSyntax.self)
    }
  }

  public var unexpectedAfterDeclName: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 6)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 6, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberAccessExprSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeBase,
    \Self.base,
    \Self.unexpectedBetweenBaseAndPeriod,
    \Self.period,
    \Self.unexpectedBetweenPeriodAndDeclName,
    \Self.declName,
    \Self.unexpectedAfterDeclName
  ])
}

// MARK: - MemberBlockItemListFileSyntax

/// Syntax for declaration macro expansions in type contexts, never appear in Swift source code.
///
/// ### Children
/// 
///  - `members`: ``MemberBlockItemListSyntax``
///  - `endOfFileToken`: ``
@_spi(Compiler)
public struct MemberBlockItemListFileSyntax: SyntaxProtocol, SyntaxHashable, _LeafSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .memberBlockItemListFile else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeMembers: UnexpectedNodesSyntax? = nil,
    members: MemberBlockItemListSyntax,
    _ unexpectedBetweenMembersAndEndOfFileToken: UnexpectedNodesSyntax? = nil,
    endOfFileToken: TokenSyntax = .endOfFileToken(),
    _ unexpectedAfterEndOfFileToken: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeMembers,
      members,
      unexpectedBetweenMembersAndEndOfFileToken,
      endOfFileToken,
      unexpectedAfterEndOfFileToken
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeMembers?.raw,
        members.raw,
        unexpectedBetweenMembersAndEndOfFileToken?.raw,
        endOfFileToken.raw,
        unexpectedAfterEndOfFileToken?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.memberBlockItemListFile,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeMembers: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberBlockItemListFileSyntax.self)
    }
  }

  public var members: MemberBlockItemListSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(MemberBlockItemListSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberBlockItemListFileSyntax.self)
    }
  }

  public var unexpectedBetweenMembersAndEndOfFileToken: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberBlockItemListFileSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be ``.
  public var endOfFileToken: TokenSyntax {
    get {
      return Syntax(self).child(at: 3)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberBlockItemListFileSyntax.self)
    }
  }

  public var unexpectedAfterEndOfFileToken: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberBlockItemListFileSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeMembers,
    \Self.members,
    \Self.unexpectedBetweenMembersAndEndOfFileToken,
    \Self.endOfFileToken,
    \Self.unexpectedAfterEndOfFileToken
  ])
}

// MARK: - MemberBlockItemSyntax

/// A member declaration of a type consisting of a declaration and an optional semicolon;
///
/// ### Children
/// 
///  - `decl`: ``DeclSyntax``
///  - `semicolon`: `;`?
///
/// ### Contained in
/// 
///  - ``MemberBlockItemListSyntax``
public struct MemberBlockItemSyntax: SyntaxProtocol, SyntaxHashable, _LeafSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .memberBlockItem else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - decl: The declaration of the type member.
  ///   - semicolon: An optional trailing semicolon.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeDecl: UnexpectedNodesSyntax? = nil,
    decl: some DeclSyntaxProtocol,
    _ unexpectedBetweenDeclAndSemicolon: UnexpectedNodesSyntax? = nil,
    semicolon: TokenSyntax? = nil,
    _ unexpectedAfterSemicolon: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeDecl,
      decl,
      unexpectedBetweenDeclAndSemicolon,
      semicolon,
      unexpectedAfterSemicolon
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeDecl?.raw,
        decl.raw,
        unexpectedBetweenDeclAndSemicolon?.raw,
        semicolon?.raw,
        unexpectedAfterSemicolon?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.memberBlockItem,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeDecl: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberBlockItemSyntax.self)
    }
  }

  /// The declaration of the type member.
  public var decl: DeclSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(DeclSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberBlockItemSyntax.self)
    }
  }

  public var unexpectedBetweenDeclAndSemicolon: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberBlockItemSyntax.self)
    }
  }

  /// An optional trailing semicolon.
  ///
  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `;`.
  public var semicolon: TokenSyntax? {
    get {
      return Syntax(self).child(at: 3)?.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberBlockItemSyntax.self)
    }
  }

  public var unexpectedAfterSemicolon: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberBlockItemSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeDecl,
    \Self.decl,
    \Self.unexpectedBetweenDeclAndSemicolon,
    \Self.semicolon,
    \Self.unexpectedAfterSemicolon
  ])
}

// MARK: - MemberBlockSyntax

/// ### Children
/// 
///  - `leftBrace`: `{`
///  - `members`: ``MemberBlockItemListSyntax``
///  - `rightBrace`: `}`
///
/// ### Contained in
/// 
///  - ``ActorDeclSyntax``.``ActorDeclSyntax/memberBlock``
///  - ``ClassDeclSyntax``.``ClassDeclSyntax/memberBlock``
///  - ``EnumDeclSyntax``.``EnumDeclSyntax/memberBlock``
///  - ``ExtensionDeclSyntax``.``ExtensionDeclSyntax/memberBlock``
///  - ``ProtocolDeclSyntax``.``ProtocolDeclSyntax/memberBlock``
///  - ``StructDeclSyntax``.``StructDeclSyntax/memberBlock``
public struct MemberBlockSyntax: SyntaxProtocol, SyntaxHashable, _LeafSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .memberBlock else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeLeftBrace: UnexpectedNodesSyntax? = nil,
    leftBrace: TokenSyntax = .leftBraceToken(),
    _ unexpectedBetweenLeftBraceAndMembers: UnexpectedNodesSyntax? = nil,
    members: MemberBlockItemListSyntax,
    _ unexpectedBetweenMembersAndRightBrace: UnexpectedNodesSyntax? = nil,
    rightBrace: TokenSyntax = .rightBraceToken(),
    _ unexpectedAfterRightBrace: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeLeftBrace,
      leftBrace,
      unexpectedBetweenLeftBraceAndMembers,
      members,
      unexpectedBetweenMembersAndRightBrace,
      rightBrace,
      unexpectedAfterRightBrace
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeLeftBrace?.raw,
        leftBrace.raw,
        unexpectedBetweenLeftBraceAndMembers?.raw,
        members.raw,
        unexpectedBetweenMembersAndRightBrace?.raw,
        rightBrace.raw,
        unexpectedAfterRightBrace?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.memberBlock,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeLeftBrace: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberBlockSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `{`.
  public var leftBrace: TokenSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberBlockSyntax.self)
    }
  }

  public var unexpectedBetweenLeftBraceAndMembers: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberBlockSyntax.self)
    }
  }

  public var members: MemberBlockItemListSyntax {
    get {
      return Syntax(self).child(at: 3)!.cast(MemberBlockItemListSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberBlockSyntax.self)
    }
  }

  /// Adds the provided `element` to the node's `members`
  /// collection.
  ///
  /// - param element: The new `Member` to add to the node's
  ///                  `members` collection.
  /// - returns: A copy of the receiver with the provided `Member`
  ///            appended to its `members` collection.
  @available(*, deprecated, message: "Use node.members.append(newElement) instead")
  public func addMember(_ element: MemberBlockItemSyntax) -> MemberBlockSyntax {
    var collection: RawSyntax
    let arena = RawSyntaxArena()
    if let col = raw.layoutView!.children[3] {
      collection = col.layoutView!.appending(element.raw, arena: arena)
    } else {
      collection = RawSyntax.makeLayout(kind: SyntaxKind.memberBlockItemList,
                                        from: [element.raw], arena: arena)
    }
    return Syntax(self)
      .replacingChild(
        at: 3,
        with: collection,
        rawNodeArena: arena,
        rawAllocationArena: arena
      )
      .cast(MemberBlockSyntax.self)
  }

  public var unexpectedBetweenMembersAndRightBrace: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberBlockSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `}`.
  public var rightBrace: TokenSyntax {
    get {
      return Syntax(self).child(at: 5)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 5, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberBlockSyntax.self)
    }
  }

  public var unexpectedAfterRightBrace: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 6)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 6, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberBlockSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeLeftBrace,
    \Self.leftBrace,
    \Self.unexpectedBetweenLeftBraceAndMembers,
    \Self.members,
    \Self.unexpectedBetweenMembersAndRightBrace,
    \Self.rightBrace,
    \Self.unexpectedAfterRightBrace
  ])
}

// MARK: - MemberTypeSyntax

/// ### Children
/// 
///  - `baseType`: ``TypeSyntax``
///  - `period`: `.`
///  - `moduleSelector`: ``ModuleSelectorSyntax``?
///  - `name`: (`<identifier>` | `self`)
///  - `genericArgumentClause`: ``GenericArgumentClauseSyntax``?
public struct MemberTypeSyntax: TypeSyntaxProtocol, SyntaxHashable, _LeafTypeSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .memberType else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeBaseType: UnexpectedNodesSyntax? = nil,
    baseType: some TypeSyntaxProtocol,
    _ unexpectedBetweenBaseTypeAndPeriod: UnexpectedNodesSyntax? = nil,
    period: TokenSyntax = .periodToken(),
    _ unexpectedBetweenPeriodAndModuleSelector: UnexpectedNodesSyntax? = nil,
    moduleSelector: ModuleSelectorSyntax? = nil,
    _ unexpectedBetweenModuleSelectorAndName: UnexpectedNodesSyntax? = nil,
    name: TokenSyntax,
    _ unexpectedBetweenNameAndGenericArgumentClause: UnexpectedNodesSyntax? = nil,
    genericArgumentClause: GenericArgumentClauseSyntax? = nil,
    _ unexpectedAfterGenericArgumentClause: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeBaseType,
      baseType,
      unexpectedBetweenBaseTypeAndPeriod,
      period,
      unexpectedBetweenPeriodAndModuleSelector,
      moduleSelector,
      unexpectedBetweenModuleSelectorAndName,
      name,
      unexpectedBetweenNameAndGenericArgumentClause,
      genericArgumentClause,
      unexpectedAfterGenericArgumentClause
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeBaseType?.raw,
        baseType.raw,
        unexpectedBetweenBaseTypeAndPeriod?.raw,
        period.raw,
        unexpectedBetweenPeriodAndModuleSelector?.raw,
        moduleSelector?.raw,
        unexpectedBetweenModuleSelectorAndName?.raw,
        name.raw,
        unexpectedBetweenNameAndGenericArgumentClause?.raw,
        genericArgumentClause?.raw,
        unexpectedAfterGenericArgumentClause?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.memberType,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeBaseType: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberTypeSyntax.self)
    }
  }

  public var baseType: TypeSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TypeSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberTypeSyntax.self)
    }
  }

  public var unexpectedBetweenBaseTypeAndPeriod: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberTypeSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `.`.
  public var period: TokenSyntax {
    get {
      return Syntax(self).child(at: 3)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberTypeSyntax.self)
    }
  }

  public var unexpectedBetweenPeriodAndModuleSelector: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberTypeSyntax.self)
    }
  }

  public var moduleSelector: ModuleSelectorSyntax? {
    get {
      return Syntax(self).child(at: 5)?.cast(ModuleSelectorSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 5, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberTypeSyntax.self)
    }
  }

  public var unexpectedBetweenModuleSelectorAndName: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 6)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 6, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberTypeSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be one of the following kinds:
  ///  - `<identifier>`
  ///  - `self`
  public var name: TokenSyntax {
    get {
      return Syntax(self).child(at: 7)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 7, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberTypeSyntax.self)
    }
  }

  public var unexpectedBetweenNameAndGenericArgumentClause: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 8)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 8, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberTypeSyntax.self)
    }
  }

  public var genericArgumentClause: GenericArgumentClauseSyntax? {
    get {
      return Syntax(self).child(at: 9)?.cast(GenericArgumentClauseSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 9, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberTypeSyntax.self)
    }
  }

  public var unexpectedAfterGenericArgumentClause: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 10)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 10, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MemberTypeSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeBaseType,
    \Self.baseType,
    \Self.unexpectedBetweenBaseTypeAndPeriod,
    \Self.period,
    \Self.unexpectedBetweenPeriodAndModuleSelector,
    \Self.moduleSelector,
    \Self.unexpectedBetweenModuleSelectorAndName,
    \Self.name,
    \Self.unexpectedBetweenNameAndGenericArgumentClause,
    \Self.genericArgumentClause,
    \Self.unexpectedAfterGenericArgumentClause
  ])
}

// MARK: - MetatypeTypeSyntax

/// ### Children
/// 
///  - `baseType`: ``TypeSyntax``
///  - `period`: `.`
///  - `metatypeSpecifier`: (`Type` | `Protocol`)
public struct MetatypeTypeSyntax: TypeSyntaxProtocol, SyntaxHashable, _LeafTypeSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .metatypeType else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeBaseType: UnexpectedNodesSyntax? = nil,
    baseType: some TypeSyntaxProtocol,
    _ unexpectedBetweenBaseTypeAndPeriod: UnexpectedNodesSyntax? = nil,
    period: TokenSyntax = .periodToken(),
    _ unexpectedBetweenPeriodAndMetatypeSpecifier: UnexpectedNodesSyntax? = nil,
    metatypeSpecifier: TokenSyntax,
    _ unexpectedAfterMetatypeSpecifier: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeBaseType,
      baseType,
      unexpectedBetweenBaseTypeAndPeriod,
      period,
      unexpectedBetweenPeriodAndMetatypeSpecifier,
      metatypeSpecifier,
      unexpectedAfterMetatypeSpecifier
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeBaseType?.raw,
        baseType.raw,
        unexpectedBetweenBaseTypeAndPeriod?.raw,
        period.raw,
        unexpectedBetweenPeriodAndMetatypeSpecifier?.raw,
        metatypeSpecifier.raw,
        unexpectedAfterMetatypeSpecifier?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.metatypeType,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeBaseType: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MetatypeTypeSyntax.self)
    }
  }

  public var baseType: TypeSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TypeSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MetatypeTypeSyntax.self)
    }
  }

  public var unexpectedBetweenBaseTypeAndPeriod: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MetatypeTypeSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `.`.
  public var period: TokenSyntax {
    get {
      return Syntax(self).child(at: 3)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MetatypeTypeSyntax.self)
    }
  }

  public var unexpectedBetweenPeriodAndMetatypeSpecifier: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MetatypeTypeSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be one of the following kinds:
  ///  - `Type`
  ///  - `Protocol`
  public var metatypeSpecifier: TokenSyntax {
    get {
      return Syntax(self).child(at: 5)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 5, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MetatypeTypeSyntax.self)
    }
  }

  public var unexpectedAfterMetatypeSpecifier: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 6)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 6, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MetatypeTypeSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeBaseType,
    \Self.baseType,
    \Self.unexpectedBetweenBaseTypeAndPeriod,
    \Self.period,
    \Self.unexpectedBetweenPeriodAndMetatypeSpecifier,
    \Self.metatypeSpecifier,
    \Self.unexpectedAfterMetatypeSpecifier
  ])
}

// MARK: - MissingDeclSyntax

/// In case the source code is missing a declaration, this node stands in place of the missing declaration.
///
/// ### Children
/// 
///  - `attributes`: ``AttributeListSyntax``
///  - `modifiers`: ``DeclModifierListSyntax``
///  - `placeholder`: `<identifier>`
///
/// ### Contained in
/// 
///  - ``ABIAttributeArgumentsSyntax``.``ABIAttributeArgumentsSyntax/provider``
public struct MissingDeclSyntax: DeclSyntaxProtocol, SyntaxHashable, _LeafDeclSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .missingDecl else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - attributes: If there were standalone attributes without a declaration to attach them to, the ``MissingDeclSyntax`` will contain these.
  ///   - modifiers: If there were standalone modifiers without a declaration to attach them to, the ``MissingDeclSyntax`` will contain these.
  ///   - placeholder: A placeholder, i.e. `<#decl#>`, that can be inserted into the source code to represent the missing declaration.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeAttributes: UnexpectedNodesSyntax? = nil,
    attributes: AttributeListSyntax = [],
    _ unexpectedBetweenAttributesAndModifiers: UnexpectedNodesSyntax? = nil,
    modifiers: DeclModifierListSyntax = [],
    _ unexpectedBetweenModifiersAndPlaceholder: UnexpectedNodesSyntax? = nil,
    placeholder: TokenSyntax,
    _ unexpectedAfterPlaceholder: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeAttributes,
      attributes,
      unexpectedBetweenAttributesAndModifiers,
      modifiers,
      unexpectedBetweenModifiersAndPlaceholder,
      placeholder,
      unexpectedAfterPlaceholder
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeAttributes?.raw,
        attributes.raw,
        unexpectedBetweenAttributesAndModifiers?.raw,
        modifiers.raw,
        unexpectedBetweenModifiersAndPlaceholder?.raw,
        placeholder.raw,
        unexpectedAfterPlaceholder?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.missingDecl,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeAttributes: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingDeclSyntax.self)
    }
  }

  /// If there were standalone attributes without a declaration to attach them to, the ``MissingDeclSyntax`` will contain these.
  public var attributes: AttributeListSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(AttributeListSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingDeclSyntax.self)
    }
  }

  /// Adds the provided `element` to the node's `attributes`
  /// collection.
  ///
  /// - param element: The new `Attribute` to add to the node's
  ///                  `attributes` collection.
  /// - returns: A copy of the receiver with the provided `Attribute`
  ///            appended to its `attributes` collection.
  @available(*, deprecated, message: "Use node.attributes.append(newElement) instead")
  public func addAttribute(_ element: Syntax) -> MissingDeclSyntax {
    var collection: RawSyntax
    let arena = RawSyntaxArena()
    if let col = raw.layoutView!.children[1] {
      collection = col.layoutView!.appending(element.raw, arena: arena)
    } else {
      collection = RawSyntax.makeLayout(kind: SyntaxKind.attributeList,
                                        from: [element.raw], arena: arena)
    }
    return Syntax(self)
      .replacingChild(
        at: 1,
        with: collection,
        rawNodeArena: arena,
        rawAllocationArena: arena
      )
      .cast(MissingDeclSyntax.self)
  }

  public var unexpectedBetweenAttributesAndModifiers: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingDeclSyntax.self)
    }
  }

  /// If there were standalone modifiers without a declaration to attach them to, the ``MissingDeclSyntax`` will contain these.
  public var modifiers: DeclModifierListSyntax {
    get {
      return Syntax(self).child(at: 3)!.cast(DeclModifierListSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingDeclSyntax.self)
    }
  }

  /// Adds the provided `element` to the node's `modifiers`
  /// collection.
  ///
  /// - param element: The new `Modifier` to add to the node's
  ///                  `modifiers` collection.
  /// - returns: A copy of the receiver with the provided `Modifier`
  ///            appended to its `modifiers` collection.
  @available(*, deprecated, message: "Use node.modifiers.append(newElement) instead")
  public func addModifier(_ element: DeclModifierSyntax) -> MissingDeclSyntax {
    var collection: RawSyntax
    let arena = RawSyntaxArena()
    if let col = raw.layoutView!.children[3] {
      collection = col.layoutView!.appending(element.raw, arena: arena)
    } else {
      collection = RawSyntax.makeLayout(kind: SyntaxKind.declModifierList,
                                        from: [element.raw], arena: arena)
    }
    return Syntax(self)
      .replacingChild(
        at: 3,
        with: collection,
        rawNodeArena: arena,
        rawAllocationArena: arena
      )
      .cast(MissingDeclSyntax.self)
  }

  public var unexpectedBetweenModifiersAndPlaceholder: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingDeclSyntax.self)
    }
  }

  /// A placeholder, i.e. `<#decl#>`, that can be inserted into the source code to represent the missing declaration.
  /// 
  /// This token should always have `presence = .missing`.
  ///
  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `<identifier>`.
  public var placeholder: TokenSyntax {
    get {
      return Syntax(self).child(at: 5)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 5, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingDeclSyntax.self)
    }
  }

  public var unexpectedAfterPlaceholder: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 6)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 6, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingDeclSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeAttributes,
    \Self.attributes,
    \Self.unexpectedBetweenAttributesAndModifiers,
    \Self.modifiers,
    \Self.unexpectedBetweenModifiersAndPlaceholder,
    \Self.placeholder,
    \Self.unexpectedAfterPlaceholder
  ])
}

// MARK: - MissingExprSyntax

/// In case the source code is missing an expression, this node stands in place of the missing expression.
///
/// ### Children
/// 
///  - `placeholder`: `<identifier>`
public struct MissingExprSyntax: ExprSyntaxProtocol, SyntaxHashable, _LeafExprSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .missingExpr else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - placeholder: A placeholder, i.e. `<#expression#>`, that can be inserted into the source code to represent the missing expression.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforePlaceholder: UnexpectedNodesSyntax? = nil,
    placeholder: TokenSyntax,
    _ unexpectedAfterPlaceholder: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (unexpectedBeforePlaceholder, placeholder, unexpectedAfterPlaceholder))) { (arena, _) in
      let layout: [RawSyntax?] = [unexpectedBeforePlaceholder?.raw, placeholder.raw, unexpectedAfterPlaceholder?.raw]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.missingExpr,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforePlaceholder: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingExprSyntax.self)
    }
  }

  /// A placeholder, i.e. `<#expression#>`, that can be inserted into the source code to represent the missing expression.
  /// 
  /// This token should always have `presence = .missing`.
  ///
  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `<identifier>`.
  public var placeholder: TokenSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingExprSyntax.self)
    }
  }

  public var unexpectedAfterPlaceholder: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingExprSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([\Self.unexpectedBeforePlaceholder, \Self.placeholder, \Self.unexpectedAfterPlaceholder])
}

// MARK: - MissingPatternSyntax

/// In case the source code is missing a pattern, this node stands in place of the missing pattern.
///
/// ### Children
/// 
///  - `placeholder`: `<identifier>`
public struct MissingPatternSyntax: PatternSyntaxProtocol, SyntaxHashable, _LeafPatternSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .missingPattern else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - placeholder: A placeholder, i.e. `<#pattern#>`, that can be inserted into the source code to represent the missing pattern.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforePlaceholder: UnexpectedNodesSyntax? = nil,
    placeholder: TokenSyntax,
    _ unexpectedAfterPlaceholder: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (unexpectedBeforePlaceholder, placeholder, unexpectedAfterPlaceholder))) { (arena, _) in
      let layout: [RawSyntax?] = [unexpectedBeforePlaceholder?.raw, placeholder.raw, unexpectedAfterPlaceholder?.raw]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.missingPattern,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforePlaceholder: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingPatternSyntax.self)
    }
  }

  /// A placeholder, i.e. `<#pattern#>`, that can be inserted into the source code to represent the missing pattern.
  /// 
  /// This token should always have `presence = .missing`.
  ///
  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `<identifier>`.
  public var placeholder: TokenSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingPatternSyntax.self)
    }
  }

  public var unexpectedAfterPlaceholder: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingPatternSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([\Self.unexpectedBeforePlaceholder, \Self.placeholder, \Self.unexpectedAfterPlaceholder])
}

// MARK: - MissingStmtSyntax

/// In case the source code is missing a statement, this node stands in place of the missing statement.
///
/// ### Children
/// 
///  - `placeholder`: `<identifier>`
public struct MissingStmtSyntax: StmtSyntaxProtocol, SyntaxHashable, _LeafStmtSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .missingStmt else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - placeholder: A placeholder, i.e. `<#statement#>`, that can be inserted into the source code to represent the missing pattern.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforePlaceholder: UnexpectedNodesSyntax? = nil,
    placeholder: TokenSyntax,
    _ unexpectedAfterPlaceholder: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (unexpectedBeforePlaceholder, placeholder, unexpectedAfterPlaceholder))) { (arena, _) in
      let layout: [RawSyntax?] = [unexpectedBeforePlaceholder?.raw, placeholder.raw, unexpectedAfterPlaceholder?.raw]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.missingStmt,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforePlaceholder: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingStmtSyntax.self)
    }
  }

  /// A placeholder, i.e. `<#statement#>`, that can be inserted into the source code to represent the missing pattern.
  /// 
  /// This token should always have `presence = .missing`.
  ///
  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `<identifier>`.
  public var placeholder: TokenSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingStmtSyntax.self)
    }
  }

  public var unexpectedAfterPlaceholder: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingStmtSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([\Self.unexpectedBeforePlaceholder, \Self.placeholder, \Self.unexpectedAfterPlaceholder])
}

// MARK: - MissingSyntax

/// In case the source code is missing a syntax node, this node stands in place of the missing node.
///
/// ### Children
/// 
///  - `placeholder`: `<identifier>`
public struct MissingSyntax: SyntaxProtocol, SyntaxHashable, _LeafSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .missing else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - placeholder: A placeholder, i.e. `<#syntax#>`, that can be inserted into the source code to represent the missing pattern.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforePlaceholder: UnexpectedNodesSyntax? = nil,
    placeholder: TokenSyntax,
    _ unexpectedAfterPlaceholder: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (unexpectedBeforePlaceholder, placeholder, unexpectedAfterPlaceholder))) { (arena, _) in
      let layout: [RawSyntax?] = [unexpectedBeforePlaceholder?.raw, placeholder.raw, unexpectedAfterPlaceholder?.raw]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.missing,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforePlaceholder: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingSyntax.self)
    }
  }

  /// A placeholder, i.e. `<#syntax#>`, that can be inserted into the source code to represent the missing pattern.
  /// 
  /// This token should always have `presence = .missing`
  ///
  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `<identifier>`.
  public var placeholder: TokenSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingSyntax.self)
    }
  }

  public var unexpectedAfterPlaceholder: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([\Self.unexpectedBeforePlaceholder, \Self.placeholder, \Self.unexpectedAfterPlaceholder])
}

// MARK: - MissingTypeSyntax

/// In case the source code is missing a type, this node stands in place of the missing type.
///
/// ### Children
/// 
///  - `placeholder`: `<identifier>`
public struct MissingTypeSyntax: TypeSyntaxProtocol, SyntaxHashable, _LeafTypeSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .missingType else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - placeholder: A placeholder, i.e. `<#type#>`, that can be inserted into the source code to represent the missing type.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforePlaceholder: UnexpectedNodesSyntax? = nil,
    placeholder: TokenSyntax,
    _ unexpectedAfterPlaceholder: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (unexpectedBeforePlaceholder, placeholder, unexpectedAfterPlaceholder))) { (arena, _) in
      let layout: [RawSyntax?] = [unexpectedBeforePlaceholder?.raw, placeholder.raw, unexpectedAfterPlaceholder?.raw]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.missingType,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforePlaceholder: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingTypeSyntax.self)
    }
  }

  /// A placeholder, i.e. `<#type#>`, that can be inserted into the source code to represent the missing type.
  /// 
  /// This token should always have `presence = .missing`.
  ///
  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `<identifier>`.
  public var placeholder: TokenSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingTypeSyntax.self)
    }
  }

  public var unexpectedAfterPlaceholder: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MissingTypeSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([\Self.unexpectedBeforePlaceholder, \Self.placeholder, \Self.unexpectedAfterPlaceholder])
}

// MARK: - ModuleSelectorSyntax

/// ### Children
/// 
///  - `moduleName`: `<identifier>`
///  - `colonColon`: `::`
///
/// ### Contained in
/// 
///  - ``DeclReferenceExprSyntax``.``DeclReferenceExprSyntax/moduleSelector``
///  - ``IdentifierTypeSyntax``.``IdentifierTypeSyntax/moduleSelector``
///  - ``MacroExpansionDeclSyntax``.``MacroExpansionDeclSyntax/moduleSelector``
///  - ``MacroExpansionExprSyntax``.``MacroExpansionExprSyntax/moduleSelector``
///  - ``MemberTypeSyntax``.``MemberTypeSyntax/moduleSelector``
public struct ModuleSelectorSyntax: SyntaxProtocol, SyntaxHashable, _LeafSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .moduleSelector else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeModuleName: UnexpectedNodesSyntax? = nil,
    moduleName: TokenSyntax,
    _ unexpectedBetweenModuleNameAndColonColon: UnexpectedNodesSyntax? = nil,
    colonColon: TokenSyntax = .colonColonToken(),
    _ unexpectedAfterColonColon: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeModuleName,
      moduleName,
      unexpectedBetweenModuleNameAndColonColon,
      colonColon,
      unexpectedAfterColonColon
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeModuleName?.raw,
        moduleName.raw,
        unexpectedBetweenModuleNameAndColonColon?.raw,
        colonColon.raw,
        unexpectedAfterColonColon?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.moduleSelector,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeModuleName: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(ModuleSelectorSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `<identifier>`.
  public var moduleName: TokenSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(ModuleSelectorSyntax.self)
    }
  }

  public var unexpectedBetweenModuleNameAndColonColon: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(ModuleSelectorSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `::`.
  public var colonColon: TokenSyntax {
    get {
      return Syntax(self).child(at: 3)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(ModuleSelectorSyntax.self)
    }
  }

  public var unexpectedAfterColonColon: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(ModuleSelectorSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeModuleName,
    \Self.moduleName,
    \Self.unexpectedBetweenModuleNameAndColonColon,
    \Self.colonColon,
    \Self.unexpectedAfterColonColon
  ])
}

// MARK: - MultipleTrailingClosureElementSyntax

/// ### Children
/// 
///  - `label`: (`<identifier>` | `_`)
///  - `colon`: `:`
///  - `closure`: ``ClosureExprSyntax``
///
/// ### Contained in
/// 
///  - ``MultipleTrailingClosureElementListSyntax``
public struct MultipleTrailingClosureElementSyntax: SyntaxProtocol, SyntaxHashable, _LeafSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .multipleTrailingClosureElement else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeLabel: UnexpectedNodesSyntax? = nil,
    label: TokenSyntax,
    _ unexpectedBetweenLabelAndColon: UnexpectedNodesSyntax? = nil,
    colon: TokenSyntax = .colonToken(),
    _ unexpectedBetweenColonAndClosure: UnexpectedNodesSyntax? = nil,
    closure: ClosureExprSyntax,
    _ unexpectedAfterClosure: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeLabel,
      label,
      unexpectedBetweenLabelAndColon,
      colon,
      unexpectedBetweenColonAndClosure,
      closure,
      unexpectedAfterClosure
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeLabel?.raw,
        label.raw,
        unexpectedBetweenLabelAndColon?.raw,
        colon.raw,
        unexpectedBetweenColonAndClosure?.raw,
        closure.raw,
        unexpectedAfterClosure?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.multipleTrailingClosureElement,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeLabel: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MultipleTrailingClosureElementSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be one of the following kinds:
  ///  - `<identifier>`
  ///  - `_`
  public var label: TokenSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MultipleTrailingClosureElementSyntax.self)
    }
  }

  public var unexpectedBetweenLabelAndColon: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MultipleTrailingClosureElementSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `:`.
  public var colon: TokenSyntax {
    get {
      return Syntax(self).child(at: 3)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MultipleTrailingClosureElementSyntax.self)
    }
  }

  public var unexpectedBetweenColonAndClosure: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MultipleTrailingClosureElementSyntax.self)
    }
  }

  public var closure: ClosureExprSyntax {
    get {
      return Syntax(self).child(at: 5)!.cast(ClosureExprSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 5, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MultipleTrailingClosureElementSyntax.self)
    }
  }

  public var unexpectedAfterClosure: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 6)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 6, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(MultipleTrailingClosureElementSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeLabel,
    \Self.label,
    \Self.unexpectedBetweenLabelAndColon,
    \Self.colon,
    \Self.unexpectedBetweenColonAndClosure,
    \Self.closure,
    \Self.unexpectedAfterClosure
  ])
}

// MARK: - NamedOpaqueReturnTypeSyntax

/// ### Children
/// 
///  - `genericParameterClause`: ``GenericParameterClauseSyntax``
///  - `type`: ``TypeSyntax``
public struct NamedOpaqueReturnTypeSyntax: TypeSyntaxProtocol, SyntaxHashable, _LeafTypeSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .namedOpaqueReturnType else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - genericParameterClause: The parameter clause that defines the generic parameters.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeGenericParameterClause: UnexpectedNodesSyntax? = nil,
    genericParameterClause: GenericParameterClauseSyntax,
    _ unexpectedBetweenGenericParameterClauseAndType: UnexpectedNodesSyntax? = nil,
    type: some TypeSyntaxProtocol,
    _ unexpectedAfterType: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeGenericParameterClause,
      genericParameterClause,
      unexpectedBetweenGenericParameterClauseAndType,
      type,
      unexpectedAfterType
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeGenericParameterClause?.raw,
        genericParameterClause.raw,
        unexpectedBetweenGenericParameterClauseAndType?.raw,
        type.raw,
        unexpectedAfterType?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.namedOpaqueReturnType,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeGenericParameterClause: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(NamedOpaqueReturnTypeSyntax.self)
    }
  }

  /// The parameter clause that defines the generic parameters.
  public var genericParameterClause: GenericParameterClauseSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(GenericParameterClauseSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(NamedOpaqueReturnTypeSyntax.self)
    }
  }

  public var unexpectedBetweenGenericParameterClauseAndType: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(NamedOpaqueReturnTypeSyntax.self)
    }
  }

  public var type: TypeSyntax {
    get {
      return Syntax(self).child(at: 3)!.cast(TypeSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(NamedOpaqueReturnTypeSyntax.self)
    }
  }

  public var unexpectedAfterType: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(NamedOpaqueReturnTypeSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeGenericParameterClause,
    \Self.genericParameterClause,
    \Self.unexpectedBetweenGenericParameterClauseAndType,
    \Self.type,
    \Self.unexpectedAfterType
  ])
}

// MARK: - NilLiteralExprSyntax

/// ### Children
/// 
///  - `nilKeyword`: `nil`
public struct NilLiteralExprSyntax: ExprSyntaxProtocol, SyntaxHashable, _LeafExprSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .nilLiteralExpr else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeNilKeyword: UnexpectedNodesSyntax? = nil,
    nilKeyword: TokenSyntax = .keyword(.nil),
    _ unexpectedAfterNilKeyword: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (unexpectedBeforeNilKeyword, nilKeyword, unexpectedAfterNilKeyword))) { (arena, _) in
      let layout: [RawSyntax?] = [unexpectedBeforeNilKeyword?.raw, nilKeyword.raw, unexpectedAfterNilKeyword?.raw]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.nilLiteralExpr,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeNilKeyword: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(NilLiteralExprSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `nil`.
  public var nilKeyword: TokenSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(NilLiteralExprSyntax.self)
    }
  }

  public var unexpectedAfterNilKeyword: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(NilLiteralExprSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([\Self.unexpectedBeforeNilKeyword, \Self.nilKeyword, \Self.unexpectedAfterNilKeyword])
}

// MARK: - NonisolatedSpecifierArgumentSyntax

/// A single argument that can be added to a nonisolated specifier: 'nonsending'.
/// 
/// ### Example
/// `data` in `func foo(data: nonisolated(nonsending) () async -> Void) -> X`
///
/// ### Children
/// 
///  - `leftParen`: `(`
///  - `nonsendingKeyword`: `nonsending`
///  - `rightParen`: `)`
///
/// ### Contained in
/// 
///  - ``NonisolatedTypeSpecifierSyntax``.``NonisolatedTypeSpecifierSyntax/argument``
public struct NonisolatedSpecifierArgumentSyntax: SyntaxProtocol, SyntaxHashable, _LeafSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .nonisolatedSpecifierArgument else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeLeftParen: UnexpectedNodesSyntax? = nil,
    leftParen: TokenSyntax = .leftParenToken(),
    _ unexpectedBetweenLeftParenAndNonsendingKeyword: UnexpectedNodesSyntax? = nil,
    nonsendingKeyword: TokenSyntax = .keyword(.nonsending),
    _ unexpectedBetweenNonsendingKeywordAndRightParen: UnexpectedNodesSyntax? = nil,
    rightParen: TokenSyntax = .rightParenToken(),
    _ unexpectedAfterRightParen: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeLeftParen,
      leftParen,
      unexpectedBetweenLeftParenAndNonsendingKeyword,
      nonsendingKeyword,
      unexpectedBetweenNonsendingKeywordAndRightParen,
      rightParen,
      unexpectedAfterRightParen
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeLeftParen?.raw,
        leftParen.raw,
        unexpectedBetweenLeftParenAndNonsendingKeyword?.raw,
        nonsendingKeyword.raw,
        unexpectedBetweenNonsendingKeywordAndRightParen?.raw,
        rightParen.raw,
        unexpectedAfterRightParen?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.nonisolatedSpecifierArgument,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeLeftParen: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(NonisolatedSpecifierArgumentSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `(`.
  public var leftParen: TokenSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(NonisolatedSpecifierArgumentSyntax.self)
    }
  }

  public var unexpectedBetweenLeftParenAndNonsendingKeyword: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(NonisolatedSpecifierArgumentSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `nonsending`.
  public var nonsendingKeyword: TokenSyntax {
    get {
      return Syntax(self).child(at: 3)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(NonisolatedSpecifierArgumentSyntax.self)
    }
  }

  public var unexpectedBetweenNonsendingKeywordAndRightParen: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(NonisolatedSpecifierArgumentSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `)`.
  public var rightParen: TokenSyntax {
    get {
      return Syntax(self).child(at: 5)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 5, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(NonisolatedSpecifierArgumentSyntax.self)
    }
  }

  public var unexpectedAfterRightParen: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 6)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 6, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(NonisolatedSpecifierArgumentSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeLeftParen,
    \Self.leftParen,
    \Self.unexpectedBetweenLeftParenAndNonsendingKeyword,
    \Self.nonsendingKeyword,
    \Self.unexpectedBetweenNonsendingKeywordAndRightParen,
    \Self.rightParen,
    \Self.unexpectedAfterRightParen
  ])
}

// MARK: - NonisolatedTypeSpecifierSyntax

/// ### Children
/// 
///  - `nonisolatedKeyword`: `nonisolated`
///  - `argument`: ``NonisolatedSpecifierArgumentSyntax``?
///
/// ### Contained in
/// 
///  - ``TypeSpecifierListSyntax``
public struct NonisolatedTypeSpecifierSyntax: SyntaxProtocol, SyntaxHashable, _LeafSyntaxNodeProtocol {
  public let _syntaxNode: Syntax

  public init?(_ node: __shared some SyntaxProtocol) {
    guard node.raw.kind == .nonisolatedTypeSpecifier else {
      return nil
    }
    self._syntaxNode = node._syntaxNode
  }

  @_transparent
  init(unsafeCasting node: Syntax) {
    self._syntaxNode = node
  }

  /// - Parameters:
  ///   - leadingTrivia: Trivia to be prepended to the leading trivia of the node’s first token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  ///   - trailingTrivia: Trivia to be appended to the trailing trivia of the node’s last token. If the node is empty, there is no token to attach the trivia to and the parameter is ignored.
  public init(
    leadingTrivia: Trivia? = nil,
    _ unexpectedBeforeNonisolatedKeyword: UnexpectedNodesSyntax? = nil,
    nonisolatedKeyword: TokenSyntax = .keyword(.nonisolated),
    _ unexpectedBetweenNonisolatedKeywordAndArgument: UnexpectedNodesSyntax? = nil,
    argument: NonisolatedSpecifierArgumentSyntax? = nil,
    _ unexpectedAfterArgument: UnexpectedNodesSyntax? = nil,
    trailingTrivia: Trivia? = nil
  ) {
    // Extend the lifetime of all parameters so their arenas don't get destroyed
    // before they can be added as children of the new arena.
    self = withExtendedLifetime((RawSyntaxArena(), (
      unexpectedBeforeNonisolatedKeyword,
      nonisolatedKeyword,
      unexpectedBetweenNonisolatedKeywordAndArgument,
      argument,
      unexpectedAfterArgument
    ))) { (arena, _) in
      let layout: [RawSyntax?] = [
        unexpectedBeforeNonisolatedKeyword?.raw,
        nonisolatedKeyword.raw,
        unexpectedBetweenNonisolatedKeywordAndArgument?.raw,
        argument?.raw,
        unexpectedAfterArgument?.raw
      ]
      let raw = RawSyntax.makeLayout(
        kind: SyntaxKind.nonisolatedTypeSpecifier,
        from: layout,
        arena: arena,
        leadingTrivia: leadingTrivia,
        trailingTrivia: trailingTrivia
      )
      return Syntax.forRoot(raw, rawNodeArena: arena).cast(Self.self)
    }
  }

  public var unexpectedBeforeNonisolatedKeyword: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 0)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 0, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(NonisolatedTypeSpecifierSyntax.self)
    }
  }

  /// ### Tokens
  /// 
  /// For syntax trees generated by the parser, this is guaranteed to be `nonisolated`.
  public var nonisolatedKeyword: TokenSyntax {
    get {
      return Syntax(self).child(at: 1)!.cast(TokenSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 1, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(NonisolatedTypeSpecifierSyntax.self)
    }
  }

  public var unexpectedBetweenNonisolatedKeywordAndArgument: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 2)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 2, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(NonisolatedTypeSpecifierSyntax.self)
    }
  }

  public var argument: NonisolatedSpecifierArgumentSyntax? {
    get {
      return Syntax(self).child(at: 3)?.cast(NonisolatedSpecifierArgumentSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 3, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(NonisolatedTypeSpecifierSyntax.self)
    }
  }

  public var unexpectedAfterArgument: UnexpectedNodesSyntax? {
    get {
      return Syntax(self).child(at: 4)?.cast(UnexpectedNodesSyntax.self)
    }
    set(value) {
      self = Syntax(self).replacingChild(at: 4, with: Syntax(value), rawAllocationArena: RawSyntaxArena()).cast(NonisolatedTypeSpecifierSyntax.self)
    }
  }

  public static let structure: SyntaxNodeStructure = .layout([
    \Self.unexpectedBeforeNonisolatedKeyword,
    \Self.nonisolatedKeyword,
    \Self.unexpectedBetweenNonisolatedKeywordAndArgument,
    \Self.argument,
    \Self.unexpectedAfterArgument
  ])
}
