source compatibility project violet fails with a compiler error

### Description ``` /build/swift-source-compat-suite/project_cache/violet/Sources/Compiler/Implementation/CompilerImpl+Expr.swift:14:31: error: 'Expression' is ambiguous for type lookup in this context 12 | extension CompilerImpl { 13 | 14 | internal func visit(_ node: Expression) throws { | `- error: 'Expression' is ambiguous for type lookup in this context 15 | self.setAppendLocation(node) 16 | try node.accept(self) ``` ### Reproduction builds: https://ci.swift.org/job/swift-6.0-source-compat-suite-debug-ubuntu-2004/121/ https://ci.swift.org/job/swift-6.0-source-compat-suite-ubuntu-2004/121/ https://ci.swift.org/job/swift-source-compat-suite-debug-ubuntu-2004/499/ https://ci.swift.org/job/swift-source-compat-suite-ubuntu-2004/599/ log: https://ci.swift.org/job/swift-6.0-source-compat-suite-debug-ubuntu-2004/121/artifact/build/swift-source-compat-suite/FAIL_violet_5.3_BuildSwiftPackage.log ### Expected behavior should build fine ### Environment CI ### Additional information _No response_