Razor source generator - The hintName must be unique within a generator
RazorC#DK
Type: <b>Bug</b>
## Issue Description ##
## Steps to Reproduce ##
## Expected Behavior ##
## Actual Behavior ##
Extension version: 2.140.8
VS Code version: Code 1.121.0 (f6cfa2ea2403534de03f069bdf160d06451ed282, 2026-05-19T11:51:53+02:00)
OS version: Windows_NT x64 10.0.26200
Modes:
### Logs ###
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### C# log ###
<details>
```
2026-05-27 19:48:04.540 [info] Installing C# dependencies...
2026-05-27 19:48:04.540 [info]
2026-05-27 19:48:04.540 [info] Platform: win32, x86_64
2026-05-27 19:48:04.540 [info]
2026-05-27 19:48:04.540 [info] Downloading package 'Language server for Roslyn Copilot integration'
2026-05-27 19:48:05.427 [info] (47 KB)
2026-05-27 19:48:05.428 [info] .......
2026-05-27 19:48:05.634 [info] .......
2026-05-27 19:48:05.639 [info] ......
2026-05-27 19:48:05.640 [info] Done!
2026-05-27 19:48:05.641 [info] Validating download...
2026-05-27 19:48:05.641 [info] Integrity Check succeeded.
2026-05-27 19:48:05.641 [info] Installing package 'Language server for Roslyn Copilot integration'
2026-05-27 19:48:05.641 [info]
2026-05-27 19:48:05.655 [info] Downloading package 'VSWebAssemblyBridge (Platform Agnostic)'
2026-05-27 19:48:06.778 [info] (4143 KB)
2026-05-27 19:48:06.778 [info] .
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2026-05-27 19:48:11.867 [info]
2026-05-27 19:48:11.881 [info] Done!
2026-05-27 19:48:11.885 [info] Validating download...
2026-05-27 19:48:11.886 [info] Integrity Check succeeded.
2026-05-27 19:48:11.886 [info] Installing package 'VSWebAssemblyBridge (Platform Agnostic)'
2026-05-27 19:48:11.886 [info]
2026-05-27 19:48:12.027 [info] Finished
2026-05-27 19:48:12.027 [info]
2026-05-27 19:48:17.265 [info] Locating .NET runtime version 10.0.5
2026-05-27 19:48:17.398 [info] Dotnet path: C:\Program Files\dotnet\dotnet.exe
2026-05-27 19:48:17.398 [info] Activating C# + C# Dev Kit...
2026-05-27 19:48:19.175 [info] info: Program[0]
2026-05-27 19:48:19.175 [info] Server started with process ID 7328
2026-05-27 19:48:25.361 [info] [Program] Language server initialized
2026-05-27 19:48:25.364 [info] [Program] Monitoring client process 13432 for exit
2026-05-27 19:48:25.983 [info] [initialized] [Microsoft.CodeAnalysis.LanguageServer.FileBasedPrograms.FileBasedProgramsEntryPointDiscovery] Finished discovery in 'a:\StudioCode\Bcode\PhoneStore' in 8 milliseconds
2026-05-27 19:48:27.236 [info] [textDocument/diagnostic] [Microsoft.CodeAnalysis.MSBuild.BuildHostProcessManager] .NET BuildHost started from c:\Users\TranDucAnh\.vscode\extensions\ms-dotnettools.csharp-2.140.8-win32-x64\.roslyn\Microsoft.CodeAnalysis.LanguageServer.exe reloading to start from C:\Program Files\dotnet\dotnet.exe to match necessary SDK location.
2026-05-27 19:48:29.786 [warning] [textDocument/diagnostic] [LanguageServerProjectLoader] Project C:\Users\TranDucAnh\AppData\Local\Temp\roslyn-canonical-misc\bf5f25b0-1cf6-48a1-ba45-5d0f3028833e\Canonical.csproj has unresolved dependencies
2026-05-27 19:48:29.933 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project A:\StudioCode\Bcode\PhoneStore\PhoneStore.csproj loaded by C# Dev Kit
2026-05-27 19:48:29.983 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Successfully completed load of a:\StudioCode\Bcode\PhoneStore\Models\Category.cs
2026-05-27 19:48:30.011 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Restoring Canonical.csproj: Running dotnet restore on C:\Users\TranDucAnh\AppData\Local\Temp\roslyn-canonical-misc\bf5f25b0-1cf6-48a1-ba45-5d0f3028833e\Canonical.csproj
2026-05-27 19:48:30.011 [info] [textDocument/diagnostic] [Microsoft.CodeAnalysis.LanguageServer.DotnetCliHelper] Using dotnet executable configured on the PATH
2026-05-27 19:48:30.850 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Restoring Canonical.csproj: Determining projects to restore...
2026-05-27 19:48:31.235 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Restoring Canonical.csproj: Restored C:\Users\TranDucAnh\AppData\Local\Temp\roslyn-canonical-misc\bf5f25b0-1cf6-48a1-ba45-5d0f3028833e\Canonical.csproj (in 108 ms).
2026-05-27 19:48:31.316 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Restore complete
2026-05-27 19:48:31.320 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Completed (re)load of all projects in 00:00:04.8460944
2026-05-27 19:48:31.788 [info] [workspace/didChangeWatchedFiles] [LanguageServerProjectLoader] Completed (re)load of all projects in 00:00:00.0005663
2026-05-27 19:49:18.734 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Successfully completed load of a:\StudioCode\Bcode\PhoneStore\Models\Product.cs
2026-05-27 19:49:18.734 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Completed (re)load of all projects in 00:00:00.0431311
2026-05-27 19:49:19.006 [info] [workspace/didChangeWatchedFiles] [LanguageServerProjectLoader] Successfully completed load of a:\StudioCode\Bcode\PhoneStore\Models\Product.cs
2026-05-27 19:49:19.006 [info] [workspace/didChangeWatchedFiles] [LanguageServerProjectLoader] Completed (re)load of all projects in 00:00:00.0073540
2026-05-27 19:49:40.142 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Successfully completed load of a:\StudioCode\Bcode\PhoneStore\Models\User.cs
2026-05-27 19:49:40.143 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Completed (re)load of all projects in 00:00:00.0275723
2026-05-27 19:50:01.670 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Successfully completed load of a:\StudioCode\Bcode\PhoneStore\Models\Order.cs
2026-05-27 19:50:01.670 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Completed (re)load of all projects in 00:00:00.0143834
2026-05-27 19:50:25.666 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Successfully completed load of a:\StudioCode\Bcode\PhoneStore\Models\OrderItem.cs
2026-05-27 19:50:25.667 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Completed (re)load of all projects in 00:00:00.0131302
2026-05-27 19:50:25.957 [info] [workspace/didChangeWatchedFiles] [LanguageServerProjectLoader] Successfully completed load of a:\StudioCode\Bcode\PhoneStore\Models\OrderItem.cs
2026-05-27 19:50:25.957 [info] [workspace/didChangeWatchedFiles] [LanguageServerProjectLoader] Completed (re)load of all projects in 00:00:00.0075101
2026-05-27 19:50:48.771 [warning] [textDocument/diagnostic] [LSP] Ignoring diagnostics request for untracked document: file:///a:/StudioCode/Bcode/PhoneStore/Models/OrderItem.cs
2026-05-27 19:50:48.772 [warning] [textDocument/diagnostic] [LSP] Ignoring diagnostics request for untracked document: file:///a:/StudioCode/Bcode/PhoneStore/Models/OrderItem.cs
2026-05-27 19:50:48.772 [warning] [textDocument/diagnostic] [LSP] Ignoring diagnostics request for untracked document: file:///a:/StudioCode/Bcode/PhoneStore/Models/OrderItem.cs
2026-05-27 19:51:11.876 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Successfully completed load of a:\StudioCode\Bcode\PhoneStore\Models\OrderItem.cs
2026-05-27 19:51:11.876 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Completed (re)load of all projects in 00:00:00.0120955
2026-05-27 19:51:12.168 [info] [workspace/didChangeWatchedFiles] [LanguageServerProjectLoader] Successfully completed load of a:\StudioCode\Bcode\PhoneStore\Models\OrderItem.cs
2026-05-27 19:51:12.168 [info] [workspace/didChangeWatchedFiles] [LanguageServerProjectLoader] Completed (re)load of all projects in 00:00:00.0058834
2026-05-27 19:51:27.441 [warning] [textDocument/diagnostic] [LSP] Ignoring diagnostics request for untracked document: file:///a:/StudioCode/Bcode/PhoneStore/Models/OrderItem.cs
2026-05-27 19:51:27.442 [warning] [textDocument/diagnostic] [LSP] Ignoring diagnostics request for untracked document: file:///a:/StudioCode/Bcode/PhoneStore/Models/OrderItem.cs
2026-05-27 19:51:27.442 [warning] [textDocument/diagnostic] [LSP] Ignoring diagnostics request for untracked document: file:///a:/StudioCode/Bcode/PhoneStore/Models/OrderItem.cs
2026-05-27 19:51:42.867 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Successfully completed load of a:\StudioCode\Bcode\PhoneStore\Models\TradeInRequest.cs
2026-05-27 19:51:42.867 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Completed (re)load of all projects in 00:00:00.0126308
2026-05-27 19:51:43.149 [info] [workspace/didChangeWatchedFiles] [LanguageServerProjectLoader] Successfully completed load of a:\StudioCode\Bcode\PhoneStore\Models\TradeInRequest.cs
2026-05-27 19:51:43.150 [info] [workspace/didChangeWatchedFiles] [LanguageServerProjectLoader] Completed (re)load of all projects in 00:00:00.0067544
2026-05-27 19:52:18.515 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Successfully completed load of a:\StudioCode\Bcode\PhoneStore\Data\PhoneStoreContext.cs
2026-05-27 19:52:18.516 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Completed (re)load of all projects in 00:00:00.0282307
2026-05-27 19:52:18.815 [info] [workspace/didChangeWatchedFiles] [LanguageServerProjectLoader] Successfully completed load of a:\StudioCode\Bcode\PhoneStore\Data\PhoneStoreContext.cs
2026-05-27 19:52:18.815 [info] [workspace/didChangeWatchedFiles] [LanguageServerProjectLoader] Completed (re)load of all projects in 00:00:00.0048968
2026-05-27 19:53:27.430 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Successfully completed load of a:\StudioCode\Bcode\PhoneStore\Controllers\AccountController.cs
2026-05-27 19:53:27.430 [info] [textDocument/diagnostic] [LanguageServerProjectLoader] Completed (re)load of all projects in 00:00:00.0097925
2026-05-27 19:53:27.752 [info] [workspace/didChangeWatchedFiles] [LanguageServerProjectLoader] Successfully completed load of a:\StudioCode\Bcode\PhoneStore\Controllers\AccountController.cs
2026-05-27 19:53:27.752 [info] [workspace/didChangeWatchedFiles] [LanguageServerProjectLoader] Completed (re)load of all projects in 00:00:00.0055530
2026-05-27 19:53:43.804 [info] [textDocument/_vs_getProjectContexts] [LanguageServerProjectLoader] Successfully completed load of a:\StudioCode\Bcode\PhoneStore\Controllers\AdminController.cs
2026-05-27 19:53:43.804 [info] [textDocument/_vs_getProjectContexts] [LanguageServerProjectLoader] Completed (re)load of all projects in 00:00:00.0105888
2026-05-27 19:53:44.092 [info] [workspace/didChangeWatchedFiles] [LanguageServerProjectLoader] Successfully completed load of a:\StudioCode\Bcode\PhoneStore\Controllers\AdminController.cs
2026-05-27 19:53:44.092 [info] [workspace/didChangeWatchedFiles] [LanguageServerProjectLoader] Completed (re)load of all projects in 00:00:00.0050165
2026-05-27 20:33:38.116 [error] Request textDocument/codeAction failed.
Message: Razor source generator did not produce a host output for project 'PhoneStore': warning CS8785: Generator 'RazorSourceGenerator' failed to generate source. It will not contribute to the output and compilation errors may occur as a result. Exception was of type 'ArgumentException' with message 'The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')'.
System.ArgumentException: The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')
at Microsoft.CodeAnalysis.AdditionalSourcesCollection.Add(String hintName, SourceText source) in /_/src/Compilers/Core/Portable/SourceGeneration/AdditionalSourcesCollection.cs:line 78
at Microsoft.CodeAnalysis.SourceOutputNode`1.AppendOutputs(IncrementalExecutionContext context, CancellationToken cancellationToken) in /_/src/Compilers/Core/Portable/SourceGeneration/Nodes/SourceOutputNode.cs:line 102
-----
Code: -32000
[object Object]
2026-05-27 20:33:38.118 [error] Request textDocument/documentSymbol failed.
Message: Razor source generator did not produce a host output for project 'PhoneStore': warning CS8785: Generator 'RazorSourceGenerator' failed to generate source. It will not contribute to the output and compilation errors may occur as a result. Exception was of type 'ArgumentException' with message 'The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')'.
System.ArgumentException: The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')
at Microsoft.CodeAnalysis.AdditionalSourcesCollection.Add(String hintName, SourceText source) in /_/src/Compilers/Core/Portable/SourceGeneration/AdditionalSourcesCollection.cs:line 78
at Microsoft.CodeAnalysis.SourceOutputNode`1.AppendOutputs(IncrementalExecutionContext context, CancellationToken cancellationToken) in /_/src/Compilers/Core/Portable/SourceGeneration/Nodes/SourceOutputNode.cs:line 102
-----
Code: -32000
[object Object]
2026-05-27 20:33:38.119 [error] Request textDocument/diagnostic failed.
Message: Razor source generator did not produce a host output for project 'PhoneStore': warning CS8785: Generator 'RazorSourceGenerator' failed to generate source. It will not contribute to the output and compilation errors may occur as a result. Exception was of type 'ArgumentException' with message 'The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')'.
System.ArgumentException: The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')
at Microsoft.CodeAnalysis.AdditionalSourcesCollection.Add(String hintName, SourceText source) in /_/src/Compilers/Core/Portable/SourceGeneration/AdditionalSourcesCollection.cs:line 78
at Microsoft.CodeAnalysis.SourceOutputNode`1.AppendOutputs(IncrementalExecutionContext context, CancellationToken cancellationToken) in /_/src/Compilers/Core/Portable/SourceGeneration/Nodes/SourceOutputNode.cs:line 102
-----
Code: -32000
[object Object]
2026-05-27 20:33:38.119 [error] Document pull failed for text document file:///a%3A/StudioCode/Bcode/PhoneStore/Views/Shared/_Layout.cshtml
Message: Razor source generator did not produce a host output for project 'PhoneStore': warning CS8785: Generator 'RazorSourceGenerator' failed to generate source. It will not contribute to the output and compilation errors may occur as a result. Exception was of type 'ArgumentException' with message 'The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')'.
System.ArgumentException: The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')
at Microsoft.CodeAnalysis.AdditionalSourcesCollection.Add(String hintName, SourceText source) in /_/src/Compilers/Core/Portable/SourceGeneration/AdditionalSourcesCollection.cs:line 78
at Microsoft.CodeAnalysis.SourceOutputNode`1.AppendOutputs(IncrementalExecutionContext context, CancellationToken cancellationToken) in /_/src/Compilers/Core/Portable/SourceGeneration/Nodes/SourceOutputNode.cs:line 102
-----
Code: -32000
[object Object]
2026-05-27 20:33:38.126 [error] Request textDocument/inlayHint failed.
Message: Razor source generator did not produce a host output for project 'PhoneStore': warning CS8785: Generator 'RazorSourceGenerator' failed to generate source. It will not contribute to the output and compilation errors may occur as a result. Exception was of type 'ArgumentException' with message 'The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')'.
System.ArgumentException: The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')
at Microsoft.CodeAnalysis.AdditionalSourcesCollection.Add(String hintName, SourceText source) in /_/src/Compilers/Core/Portable/SourceGeneration/AdditionalSourcesCollection.cs:line 78
at Microsoft.CodeAnalysis.SourceOutputNode`1.AppendOutputs(IncrementalExecutionContext context, CancellationToken cancellationToken) in /_/src/Compilers/Core/Portable/SourceGeneration/Nodes/SourceOutputNode.cs:line 102
-----
Code: -32000
[object Object]
2026-05-27 20:33:38.165 [error] Request textDocument/codeAction failed.
Message: Razor source generator did not produce a host output for project 'PhoneStore': warning CS8785: Generator 'RazorSourceGenerator' failed to generate source. It will not contribute to the output and compilation errors may occur as a result. Exception was of type 'ArgumentException' with message 'The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')'.
System.ArgumentException: The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')
at Microsoft.CodeAnalysis.AdditionalSourcesCollection.Add(String hintName, SourceText source) in /_/src/Compilers/Core/Portable/SourceGeneration/AdditionalSourcesCollection.cs:line 78
at Microsoft.CodeAnalysis.SourceOutputNode`1.AppendOutputs(IncrementalExecutionContext context, CancellationToken cancellationToken) in /_/src/Compilers/Core/Portable/SourceGeneration/Nodes/SourceOutputNode.cs:line 102
-----
Code: -32000
[object Object]
2026-05-27 20:33:38.207 [error] Request textDocument/semanticTokens/range failed.
Message: Razor source generator did not produce a host output for project 'PhoneStore': warning CS8785: Generator 'RazorSourceGenerator' failed to generate source. It will not contribute to the output and compilation errors may occur as a result. Exception was of type 'ArgumentException' with message 'The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')'.
System.ArgumentException: The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')
at Microsoft.CodeAnalysis.AdditionalSourcesCollection.Add(String hintName, SourceText source) in /_/src/Compilers/Core/Portable/SourceGeneration/AdditionalSourcesCollection.cs:line 78
at Microsoft.CodeAnalysis.SourceOutputNode`1.AppendOutputs(IncrementalExecutionContext context, CancellationToken cancellationToken) in /_/src/Compilers/Core/Portable/SourceGeneration/Nodes/SourceOutputNode.cs:line 102
-----
Code: -32000
[object Object]
2026-05-27 20:33:38.300 [error] Request textDocument/codeLens failed.
Message: Razor source generator did not produce a host output for project 'PhoneStore': warning CS8785: Generator 'RazorSourceGenerator' failed to generate source. It will not contribute to the output and compilation errors may occur as a result. Exception was of type 'ArgumentException' with message 'The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')'.
System.ArgumentException: The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')
at Microsoft.CodeAnalysis.AdditionalSourcesCollection.Add(String hintName, SourceText source) in /_/src/Compilers/Core/Portable/SourceGeneration/AdditionalSourcesCollection.cs:line 78
at Microsoft.CodeAnalysis.SourceOutputNode`1.AppendOutputs(IncrementalExecutionContext context, CancellationToken cancellationToken) in /_/src/Compilers/Core/Portable/SourceGeneration/Nodes/SourceOutputNode.cs:line 102
-----
Code: -32000
[object Object]
2026-05-27 20:33:38.350 [error] Request textDocument/documentSymbol failed.
Message: Razor source generator did not produce a host output for project 'PhoneStore': warning CS8785: Generator 'RazorSourceGenerator' failed to generate source. It will not contribute to the output and compilation errors may occur as a result. Exception was of type 'ArgumentException' with message 'The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')'.
System.ArgumentException: The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')
at Microsoft.CodeAnalysis.AdditionalSourcesCollection.Add(String hintName, SourceText source) in /_/src/Compilers/Core/Portable/SourceGeneration/AdditionalSourcesCollection.cs:line 78
at Microsoft.CodeAnalysis.SourceOutputNode`1.AppendOutputs(IncrementalExecutionContext context, CancellationToken cancellationToken) in /_/src/Compilers/Core/Portable/SourceGeneration/Nodes/SourceOutputNode.cs:line 102
-----
Code: -32000
[object Object]
2026-05-27 20:33:40.161 [error] Request textDocument/semanticTokens/range failed.
Message: Razor source generator did not produce a host output for project 'PhoneStore': warning CS8785: Generator 'RazorSourceGenerator' failed to generate source. It will not contribute to the output and compilation errors may occur as a result. Exception was of type 'ArgumentException' with message 'The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')'.
System.ArgumentException: The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')
at Microsoft.CodeAnalysis.AdditionalSourcesCollection.Add(String hintName, SourceText source) in /_/src/Compilers/Core/Portable/SourceGeneration/AdditionalSourcesCollection.cs:line 78
at Microsoft.CodeAnalysis.SourceOutputNode`1.AppendOutputs(IncrementalExecutionContext context, CancellationToken cancellationToken) in /_/src/Compilers/Core/Portable/SourceGeneration/Nodes/SourceOutputNode.cs:line 102
-----
Code: -32000
[object Object]
2026-05-27 20:33:40.312 [error] Request textDocument/codeLens failed.
Message: Razor source generator did not produce a host output for project 'PhoneStore': warning CS8785: Generator 'RazorSourceGenerator' failed to generate source. It will not contribute to the output and compilation errors may occur as a result. Exception was of type 'ArgumentException' with message 'The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')'.
System.ArgumentException: The hintName 'Views/_ViewImports_cshtml.g.cs' of the added source file must be unique within a generator. (Parameter 'hintName')
at Microsoft.CodeAnalysis.AdditionalSourcesCollection.Add(String hintName, SourceText source) in /_/src/Compilers/Core/Portable/SourceGeneration/AdditionalSourcesCollection.cs:line 78
at Microsoft.CodeAnalysis.SourceOutputNode`1.AppendOutputs(IncrementalExecutionContext context, CancellationToken cancellationToken) in /_/src/Compilers/Core/Portable/SourceGeneration/Nodes/SourceOutputNode.cs:line 102
-----
Code: -32000
[object Object]
```
</details>
### C# LSP Trace Logs log ###
<details>
```
```
</details>
## Environment Information ##
**VSCode version**: 1.121.0
**C# Extension**: 2.140.8
**Using OmniSharp**: false
<details><summary>Dotnet Information</summary>
.NET SDK:
Version: 10.0.300
Commit: caa81fa497
Workload version: 10.0.300-manifests.e0989437
MSBuild version: 18.6.3+caa81fa49
Runtime Environment:
OS Name: Windows
OS Version: 10.0.26200
OS Platform: Windows
RID: win-x64
Base Path: C:\Program Files\dotnet\sdk\10.0.300\
.NET workloads installed:
There are no installed workloads to display.
Configured to use workload sets when installing new manifests.
No workload sets are installed. Run "dotnet workload restore" to install a workload set.
Host:
Version: 10.0.8
Architecture: x64
Commit: 94ea82652c
.NET SDKs installed:
8.0.421 [C:\Program Files\dotnet\sdk]
10.0.300 [C:\Program Files\dotnet\sdk]
.NET runtimes installed:
Microsoft.AspNetCore.App 8.0.27 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 10.0.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 8.0.27 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 10.0.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 8.0.27 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 10.0.8 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Other architectures found:
x86 [C:\Program Files (x86)\dotnet]
registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]
Environment variables:
DOTNET_CLI_UI_LANGUAGE [en-US]
global.json file:
Not found
Learn more:
https://aka.ms/dotnet/info
Download .NET:
https://aka.ms/dotnet/download
</details>
<details><summary>Visual Studio Code Extensions</summary>
|Extension|Author|Version|Folder Name|
|---|---|---|---|
|auto-rename-tag|formulahendry|0.1.10|formulahendry.auto-rename-tag-0.1.10|
|cmake-tools|ms-vscode|1.23.52|ms-vscode.cmake-tools-1.23.52|
|code-runner|formulahendry|0.12.2|formulahendry.code-runner-0.12.2|
|codespaces|GitHub|1.18.13|github.codespaces-1.18.13|
|cpp-devtools|ms-vscode|0.5.13|ms-vscode.cpp-devtools-0.5.13|
|cpptools|ms-vscode|1.32.2|ms-vscode.cpptools-1.32.2-win32-x64|
|cpptools-extension-pack|ms-vscode|1.5.1|ms-vscode.cpptools-extension-pack-1.5.1|
|cpptools-themes|ms-vscode|2.0.0|ms-vscode.cpptools-themes-2.0.0|
|csdevkit|ms-dotnettools|3.20.199|ms-dotnettools.csdevkit-3.20.199-win32-x64|
|csharp|ms-dotnettools|2.140.8|ms-dotnettools.csharp-2.140.8-win32-x64|
|debugpy|ms-python|2026.6.0|ms-python.debugpy-2026.6.0-win32-x64|
|gitlens|eamodio|17.12.2|eamodio.gitlens-17.12.2|
|java|redhat|1.54.0|redhat.java-1.54.0-win32-x64|
|jupyter|ms-toolsai|2025.9.1|ms-toolsai.jupyter-2025.9.1-win32-x64|
|jupyter-keymap|ms-toolsai|1.1.2|ms-toolsai.jupyter-keymap-1.1.2|
|jupyter-renderers|ms-toolsai|1.3.0|ms-toolsai.jupyter-renderers-1.3.0|
|LiveServer|ritwickdey|5.7.10|ritwickdey.liveserver-5.7.10|
|material-icon-theme|PKief|5.35.0|pkief.material-icon-theme-5.35.0|
|oracle-java|Oracle|25.1.0|oracle.oracle-java-25.1.0|
|prettier-vscode|esbenp|12.4.0|esbenp.prettier-vscode-12.4.0|
|python|ms-python|2026.4.0|ms-python.python-2026.4.0-win32-x64|
|remote-wsl|ms-vscode-remote|0.104.3|ms-vscode-remote.remote-wsl-0.104.3|
|vscode-dotnet-runtime|ms-dotnettools|3.0.2|ms-dotnettools.vscode-dotnet-runtime-3.0.2|
|vscode-gradle|vscjava|3.17.3|vscjava.vscode-gradle-3.17.3|
|vscode-java-debug|vscjava|0.59.0|vscjava.vscode-java-debug-0.59.0|
|vscode-java-dependency|vscjava|0.27.4|vscjava.vscode-java-dependency-0.27.4|
|vscode-java-pack|vscjava|0.31.0|vscjava.vscode-java-pack-0.31.0|
|vscode-java-test|vscjava|0.45.0|vscjava.vscode-java-test-0.45.0|
|vscode-jupyter-cell-tags|ms-toolsai|0.1.9|ms-toolsai.vscode-jupyter-cell-tags-0.1.9|
|vscode-jupyter-slideshow|ms-toolsai|0.1.6|ms-toolsai.vscode-jupyter-slideshow-0.1.6|
|vscode-maven|vscjava|0.45.3|vscjava.vscode-maven-0.45.3|
|vscode-pylance|ms-python|2026.2.1|ms-python.vscode-pylance-2026.2.1|
|vscode-python-envs|ms-python|1.30.0|ms-python.vscode-python-envs-1.30.0-win32-x64|;
</details>
<details><summary>C# Settings</summary>
|Setting|Value|
|---|---|
|preferCSharpExtension|false|
|compilerDiagnosticScope|openFiles|
|analyzerDiagnosticScope|openFiles|
|enableXamlTools|true|
|useServerGC|true|;
</details>
<details>
<summary>System Info</summary>
|Item|Value|
|---|---|
|CPUs|AMD Ryzen 5 7640HS w/ Radeon 760M Graphics (12 x 4292)|
|GPU Status|2d_canvas: enabled<br>GPU0: VENDOR= 0x1002, DEVICE=0x15bf [AMD Radeon(TM) 760M], DRIVER_VENDOR=AMD, DRIVER_VERSION=32.0.31007.5012 *ACTIVE*<br>GPU1: VENDOR= 0x10de, DEVICE=0x28e1 [NVIDIA GeForce RTX 4050 Laptop GPU], DRIVER_VERSION=32.0.16.1047<br>GPU2: VENDOR= 0x1414, DEVICE=0x008c [Microsoft Basic Render Driver], DRIVER_VERSION=10.0.26100.8328<br>Machine model name: <br>Machine model version: <br>direct_rendering_display_compositor: disabled_off_ok<br>gpu_compositing: enabled<br>multiple_raster_threads: enabled_on<br>opengl: enabled_on<br>rasterization: enabled<br>raw_draw: disabled_off_ok<br>skia_graphite: disabled_off<br>trees_in_viz: disabled_off<br>video_decode: enabled<br>video_encode: enabled<br>webgl: enabled<br>webgl2: enabled<br>webgpu: enabled<br>webnn: disabled_off|
|Load (avg)|undefined|
|Memory (System)|15.31GB (1.98GB free)|
|Process Argv|--crash-reporter-id 04f40075-b3eb-425d-9d45-a5e858033331|
|Screen Reader|no|
|VM|0%|
</details><details>
<summary>A/B Experiments</summary>
```
vsliv368:30146709
binariesv615:30325510
nativeloc1:31344060
dwcopilot:31170013
dwoutputs:31242946
copilot_t_ci:31333650
e5gg6876:31282496
pythonrdcb7:31342333
6518g693:31463988
aj953862:31281341
82j33506:31327384
6abeh943:31336334
envsdeactivate2:31505458
cloudbuttont:31379625
3efgi100_wstrepl:31403338
ec5jj548:31422691
cp_cls_t_966_ss:31454198
inlinechat_v2_hd992725:31505030
4je02754:31466945
8hhj4413:31478653
38bie571_auto:31426784
cp_cls_c_1081:31454833
conptydll_true:31498968
ia-use-proxy-models-svc:31452481
e9c30283:31461165
test_treatment2:31471001
46204921:31447328
control_6dc23131:31520950
idci7584:31464702
e3e4d672:31494082
ei9d7968:31496641
chat:31457767
8hig5102:31480529
89g7j272:31518289
7e187181:31503455
i2gc6536:31499202
52612955:31516516
ghj88844:31499326
ddid_t:31478206
hmra_i5g22:31518061
getcmakediagnosticson:31489824
7df3h592:31512476
cp_cls_t_1082:31516087
logging_enabled_new:31498466
j0d79568:31499440
nes-extended-cfe-himalia-004:31500446
jb_cp_cls_c_632:31517842
56dj4588:31512888
cg448276_tst_on:31514358
32d76977:31512328
ha629193:31508444
nes-charagree-3:31521372
539gd155_c:31506875
jh5f2457_c:31515489
61138546:31518536
nes-gb-5k:31521376
```
</details>
<!-- generated by issue reporter -->
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