typed-throws with nested generic type crashes compiler

[NachoSoto]

Description

No response

Reproduction

struct T<Content> {
  enum Error: Swift.Error {}
  init() throws(Error) {}
}

Stack dump

0.	Program arguments: /Applications/Xcode-16.1.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-frontend -frontend -interpret /tmp/test.swift -Xllvm -aarch64-use-tbi -enable-objc-interop -stack-check -sdk /Applications/Xcode-16.1.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.1.sdk -color-diagnostics -new-driver-path /Applications/Xcode-16.1.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-driver -empty-abi-descriptor -resource-dir /Applications/Xcode-16.1.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift -module-name test -disable-clang-spi -target-sdk-version 15.1 -target-sdk-name macosx15.1 -external-plugin-path /Applications/Xcode-16.1.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins#/Applications/Xcode-16.1.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server -external-plugin-path /Applications/Xcode-16.1.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/local/lib/swift/host/plugins#/Applications/Xcode-16.1.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server -plugin-path /Applications/Xcode-16.1.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/plugins -plugin-path /Applications/Xcode-16.1.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/local/lib/swift/host/plugins
1.	Apple Swift version 6.0.2 (swiftlang-6.0.2.1.2 clang-1600.0.26.4)
2.	Compiling with effective version 5.10
3.	While running user code "/tmp/test.swift"
4.	While evaluating request IRGenRequest(IR Generation for module test)
5.	While emitting IR SIL function "@$s4test1TVACyxGyAC5ErrorOyx_GYKcfC".
 for 'init()' (at /tmp/test.swift:3:3)
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           0x000000010612a9ac llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 56
1  swift-frontend           0x0000000106128c00 llvm::sys::RunSignalHandlers() + 112
2  swift-frontend           0x000000010612af78 SignalHandler(int) + 292
3  libsystem_platform.dylib 0x0000000180b58184 _sigtramp + 56
4  swift-frontend           0x00000001011112e8 (anonymous namespace)::IRGenSILFunction::emitSILFunction() + 6568
5  swift-frontend           0x00000001011112e8 (anonymous namespace)::IRGenSILFunction::emitSILFunction() + 6568
6  swift-frontend           0x000000010110f49c swift::irgen::IRGenModule::emitSILFunction(swift::SILFunction*) + 2088
7  swift-frontend           0x0000000100f5b0a4 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           0x00000001010c6cd0 swift::IRGenRequest::evaluate(swift::Evaluator&, swift::IRGenDescriptor) const + 4700
9  swift-frontend           0x000000010110e9e8 swift::SimpleRequest<swift::IRGenRequest, swift::GeneratedModule (swift::IRGenDescriptor), (swift::RequestFlags)9>::evaluateRequest(swift::IRGenRequest const&, swift::Evaluator&) + 176
10 swift-frontend           0x00000001010cfbc8 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           0x00000001010c8614 swift::performIRGeneration(swift::ModuleDecl*, swift::IRGenOptions const&, swift::TBDGenOptions const&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>, llvm::StringRef, swift::PrimarySpecificPaths const&, llvm::ArrayRef<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, llvm::GlobalVariable**) + 2020
12 swift-frontend           0x0000000100b3888c generateModule(swift::CompilerInstance const&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>) + 356
13 swift-frontend           0x0000000100b39600 swift::EagerSwiftMaterializationUnit::materialize(std::__1::unique_ptr<llvm::orc::MaterializationResponsibility, std::__1::default_delete<llvm::orc::MaterializationResponsibility>>) + 68
14 swift-frontend           0x0000000100b528f0 llvm::orc::MaterializationTask::run() + 44
15 swift-frontend           0x0000000100b5c8dc void llvm::detail::UniqueFunctionBase<void, std::__1::unique_ptr<llvm::orc::Task, std::__1::default_delete<llvm::orc::Task>>>::CallImpl<void (*)(std::__1::unique_ptr<llvm::orc::Task, std::__1::default_delete<llvm::orc::Task>>)>(void*, std::__1::unique_ptr<llvm::orc::Task, std::__1::default_delete<llvm::orc::Task>>&) + 36
16 swift-frontend           0x0000000100b5518c llvm::orc::ExecutionSession::dispatchOutstandingMUs() + 296
17 swift-frontend           0x0000000100b5f068 llvm::orc::InProgressFullLookupState::complete(std::__1::unique_ptr<llvm::orc::InProgressLookupState, std::__1::default_delete<llvm::orc::InProgressLookupState>>) + 8220
18 swift-frontend           0x0000000100b4bae4 llvm::orc::ExecutionSession::OL_applyQueryPhase1(std::__1::unique_ptr<llvm::orc::InProgressLookupState, std::__1::default_delete<llvm::orc::InProgressLookupState>>, llvm::Error) + 2696
19 swift-frontend           0x0000000100b4b010 llvm::orc::ExecutionSession::lookup(llvm::orc::LookupKind, std::__1::vector<std::__1::pair<llvm::orc::JITDylib*, llvm::orc::JITDylibLookupFlags>, std::__1::allocator<std::__1::pair<llvm::orc::JITDylib*, llvm::orc::JITDylibLookupFlags>>> const&, llvm::orc::SymbolLookupSet, llvm::orc::SymbolState, llvm::unique_function<void (llvm::Expected<llvm::DenseMap<llvm::orc::SymbolStringPtr, llvm::orc::ExecutorSymbolDef, llvm::DenseMapInfo<llvm::orc::SymbolStringPtr, void>, llvm::detail::DenseMapPair<llvm::orc::SymbolStringPtr, llvm::orc::ExecutorSymbolDef>>>)>, std::__1::function<void (llvm::DenseMap<llvm::orc::JITDylib*, llvm::DenseSet<llvm::orc::SymbolStringPtr, llvm::DenseMapInfo<llvm::orc::SymbolStringPtr, void>>, llvm::DenseMapInfo<llvm::orc::JITDylib*, void>, llvm::detail::DenseMapPair<llvm::orc::JITDylib*, llvm::DenseSet<llvm::orc::SymbolStringPtr, llvm::DenseMapInfo<llvm::orc::SymbolStringPtr, void>>>> const&)>) + 996
20 swift-frontend           0x0000000100b55318 llvm::orc::ExecutionSession::lookup(std::__1::vector<std::__1::pair<llvm::orc::JITDylib*, llvm::orc::JITDylibLookupFlags>, std::__1::allocator<std::__1::pair<llvm::orc::JITDylib*, llvm::orc::JITDylibLookupFlags>>> const&, llvm::orc::SymbolLookupSet, llvm::orc::LookupKind, llvm::orc::SymbolState, std::__1::function<void (llvm::DenseMap<llvm::orc::JITDylib*, llvm::DenseSet<llvm::orc::SymbolStringPtr, llvm::DenseMapInfo<llvm::orc::SymbolStringPtr, void>>, llvm::DenseMapInfo<llvm::orc::JITDylib*, void>, llvm::detail::DenseMapPair<llvm::orc::JITDylib*, llvm::DenseSet<llvm::orc::SymbolStringPtr, llvm::DenseMapInfo<llvm::orc::SymbolStringPtr, void>>>> const&)>) + 288
21 swift-frontend           0x0000000100b556c8 llvm::orc::ExecutionSession::lookup(std::__1::vector<std::__1::pair<llvm::orc::JITDylib*, llvm::orc::JITDylibLookupFlags>, std::__1::allocator<std::__1::pair<llvm::orc::JITDylib*, llvm::orc::JITDylibLookupFlags>>> const&, llvm::orc::SymbolStringPtr, llvm::orc::SymbolState) + 272
22 swift-frontend           0x0000000100b7c8b8 llvm::orc::LLJIT::lookupLinkerMangled(llvm::orc::JITDylib&, llvm::orc::SymbolStringPtr) + 112
23 swift-frontend           0x0000000100b3a688 llvm::orc::LLJIT::lookup(llvm::orc::JITDylib&, llvm::StringRef) + 328
24 swift-frontend           0x0000000100b36524 swift::SwiftJIT::runMain(llvm::ArrayRef<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>) + 136
25 swift-frontend           0x0000000100b43f48 swift::RunImmediately(swift::CompilerInstance&, 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&, swift::IRGenOptions const&, swift::SILOptions const&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>&&) + 1028
26 swift-frontend           0x0000000100ad84e8 processCommandLineAndRunImmediately(swift::CompilerInstance&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>&&, llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, swift::FrontendObserver*, int&) + 536
27 swift-frontend           0x0000000100ad3f4c 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*) + 2044
28 swift-frontend           0x0000000100ad362c swift::performCompileStepsPostSema(swift::CompilerInstance&, int&, swift::FrontendObserver*) + 2888
29 swift-frontend           0x0000000100ad6660 performCompile(swift::CompilerInstance&, int&, swift::FrontendObserver*) + 2944
30 swift-frontend           0x0000000100ad4ea0 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 3572
31 swift-frontend           0x0000000100a5bf64 swift::mainEntry(int, char const**) + 3680
32 dyld                     0x00000001807a0274 start + 2840
Segmentation fault: 11

Expected behavior

It compiles or produces a compilation error.

Environment

swift-driver version: 1.115 Apple Swift version 6.0.2 (swiftlang-6.0.2.1.2 clang-1600.0.26.4)
Target: arm64-apple-macosx15.0

[JessyCatterwaul]

I think this is a duplicate of #74289, which is not closed. (The examples here and there are still problematic in Xcode 16.2.)

[JessyCatterwaul]

As I've noted there, your example now compiles. Instead, the crash now happens only upon actually trying to use an error instance. Progress!

struct T<Content> {
  enum Error: Swift.Error { case instance }
  init() throws(Error) { throw .instance }
}