emitSILFunction crash when using typed throws on a @propertyWrapper method with nested error type

[JadenGeller]

Description

The reproduction crashes the compiler unless either:
(a) throws(UnderflowError) is replaced with throws
(b) struct UnderflowError {} is unnested from the property wrapper namespace

Reproduction

@propertyWrapper
struct Stack<Value> {
    private var history: [Value]

    init(wrappedValue initialValue: Value) {
        self.history = [initialValue]
    }

    var wrappedValue: Value {
        get { history[history.endIndex - 1] }
        _modify { yield &history[history.endIndex - 1] }
        set { history[history.endIndex - 1] = newValue }
    }

    var projectedValue: Self {
        return self
    }

    mutating func push() {
        history.append(wrappedValue)
    }
    
    struct UnderflowError: Error { }

    mutating func pop() throws(UnderflowError) {
        guard history.count > 1 else { throw UnderflowError() }
        history.removeLast()
    }
}

Stack dump

0.	Program arguments: /Library/Developer/CommandLineTools/usr/bin/swift-frontend -frontend -c -primary-file "Untitled 7.swift" -target arm64-apple-macosx15.0 -Xllvm -aarch64-use-tbi -enable-objc-interop -stack-check -sdk /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -new-driver-path /Library/Developer/CommandLineTools/usr/bin/swift-driver -empty-abi-descriptor -resource-dir /Library/Developer/CommandLineTools/usr/lib/swift -module-name main -disable-clang-spi -target-sdk-version 15.0 -target-sdk-name macosx15.0 -external-plugin-path /Library/Developer/Developer/usr/lib/swift/host/plugins#/Library/Developer/Developer/usr/bin/swift-plugin-server -external-plugin-path /Library/Developer/Developer/usr/local/lib/swift/host/plugins#/Library/Developer/Developer/usr/bin/swift-plugin-server -plugin-path /Library/Developer/CommandLineTools/usr/lib/swift/host/plugins -plugin-path /Library/Developer/CommandLineTools/usr/local/lib/swift/host/plugins -o "/var/folders/z7/v1gmxzg94ys8g2tdh5kdfhpm0000gn/T/TemporaryDirectory.QoT539/Untitled 7-1.o"
1.	Apple Swift version 6.0 (swiftlang-6.0.0.9.10 clang-1600.0.26.2)
2.	Compiling with effective version 5.10
3.	While evaluating request IRGenRequest(IR Generation for file "Untitled 7.swift")
4.	While emitting IR SIL function "@$s4main5StackV3popyyAC14UnderflowErrorVyx_GYKF".
 for 'pop()' (at Untitled 7.swift:26:14)
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  swift-frontend           0x000000010a8170fc llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 56
1  swift-frontend           0x000000010a815350 llvm::sys::RunSignalHandlers() + 112
2  swift-frontend           0x000000010a8176c8 SignalHandler(int) + 292
3  libsystem_platform.dylib 0x0000000194b94184 _sigtramp + 56
4  swift-frontend           0x00000001057ff254 (anonymous namespace)::IRGenSILFunction::emitSILFunction() + 6568
5  swift-frontend           0x00000001057ff254 (anonymous namespace)::IRGenSILFunction::emitSILFunction() + 6568
6  swift-frontend           0x00000001057fd408 swift::irgen::IRGenModule::emitSILFunction(swift::SILFunction*) + 2088
7  swift-frontend           0x0000000105649098 swift::irgen::IRGenerator::emitGlobalTopLevel(std::__1::vector<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>> const&) + 3364
8  swift-frontend           0x00000001057b4c44 swift::IRGenRequest::evaluate(swift::Evaluator&, swift::IRGenDescriptor) const + 4700
9  swift-frontend           0x00000001057fc954 swift::SimpleRequest<swift::IRGenRequest, swift::GeneratedModule (swift::IRGenDescriptor), (swift::RequestFlags)9>::evaluateRequest(swift::IRGenRequest const&, swift::Evaluator&) + 176
10 swift-frontend           0x00000001057bdb3c swift::IRGenRequest::OutputType swift::Evaluator::getResultUncached<swift::IRGenRequest, swift::IRGenRequest::OutputType swift::evaluateOrFatal<swift::IRGenRequest>(swift::Evaluator&, swift::IRGenRequest)::'lambda'()>(swift::IRGenRequest const&, swift::IRGenRequest::OutputType swift::evaluateOrFatal<swift::IRGenRequest>(swift::Evaluator&, swift::IRGenRequest)::'lambda'()) + 784
11 swift-frontend           0x00000001057b7574 swift::performIRGeneration(swift::FileUnit*, swift::IRGenOptions const&, swift::TBDGenOptions const&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>, llvm::StringRef, swift::PrimarySpecificPaths const&, llvm::StringRef, llvm::GlobalVariable**) + 180
12 swift-frontend           0x00000001051c685c generateIR(swift::IRGenOptions const&, swift::TBDGenOptions const&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>, swift::PrimarySpecificPaths const&, llvm::StringRef, llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, llvm::GlobalVariable*&, llvm::ArrayRef<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>) + 156
13 swift-frontend           0x00000001051c2088 performCompileStepsPostSILGen(swift::CompilerInstance&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>, llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, swift::PrimarySpecificPaths const&, int&, swift::FrontendObserver*) + 2176
14 swift-frontend           0x00000001051c0f74 swift::performCompileStepsPostSema(swift::CompilerInstance&, int&, swift::FrontendObserver*) + 984
15 swift-frontend           0x00000001051c4228 performCompile(swift::CompilerInstance&, int&, swift::FrontendObserver*) + 1680
16 swift-frontend           0x00000001051c2f58 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 3572
17 swift-frontend           0x000000010514a01c swift::mainEntry(int, char const**) + 3680
18 dyld                     0x00000001947dc274 start + 2840

Expected behavior

It should not crash.

Environment

Apple Swift version 6.0 (swiftlang-6.0.0.9.10 clang-1600.0.26.2)
Target: arm64-apple-macosx15.0

Additional information

No response