Open Radar

 
Summary:
N/A

Steps to Reproduce:
This code:
struct A<B> {}
protocol C {
	typealias D
}
enum E<F: C where F.D == E<F>.G> {
	typealias G = A<F>
}


Expected Results:
shouldn’t crash swiftc when using -emit-module


Actual Results:
but totally does:

rob@Resonance ~/Desktop> swiftc -emit-module boom.swift
0  swift                    0x000000010fba337b llvm::sys::PrintStackTrace(__sFILE*) + 43
1  swift                    0x000000010fba3abb SignalHandler(int) + 379
2  libsystem_platform.dylib 0x00007fff83cf752a _sigtramp + 26
3  libsystem_platform.dylib 000000000000000000 _sigtramp + 2083556080
4  swift                    0x000000010e323e9e swift::GenericParamList::addNestedArchetypes(swift::ArchetypeType*, llvm::SmallPtrSetImpl<swift::ArchetypeType*>&, llvm::SmallVectorImpl<swift::ArchetypeType*>&) + 30
5  swift                    0x000000010e3240c3 swift::GenericParamList::deriveAllArchetypes(llvm::ArrayRef<swift::GenericTypeParamDecl*>, llvm::SmallVectorImpl<swift::ArchetypeType*>&) + 339
6  swift                    0x000000010dfb8c21 swift::ModuleFile::maybeReadGenericParams(swift::DeclContext*, llvm::BitstreamCursor&, swift::GenericParamList*) + 513
7  swift                    0x000000010dfb4306 swift::ModuleFile::getDecl(llvm::Fixnum<31u, unsigned int>, llvm::Optional<swift::DeclContext*>) + 11238
8  swift                    0x000000010dfb888c swift::ModuleFile::getDeclContext(llvm::Fixnum<31u, unsigned int>) + 316
9  swift                    0x000000010dfb48e8 swift::ModuleFile::getDecl(llvm::Fixnum<31u, unsigned int>, llvm::Optional<swift::DeclContext*>) + 12744
10 swift                    0x000000010dfafd70 swift::ModuleFile::getType(llvm::Fixnum<31u, unsigned int>) + 416
11 swift                    0x000000010dfb02a3 swift::ModuleFile::getType(llvm::Fixnum<31u, unsigned int>) + 1747
12 swift                    0x000000010dfb141e swift::ModuleFile::getType(llvm::Fixnum<31u, unsigned int>) + 6222
13 swift                    0x000000010dfb5329 swift::ModuleFile::getDecl(llvm::Fixnum<31u, unsigned int>, llvm::Optional<swift::DeclContext*>) + 15369
14 swift                    0x000000010dfb8f19 swift::ModuleFile::maybeReadGenericParams(swift::DeclContext*, llvm::BitstreamCursor&, swift::GenericParamList*) + 1273
15 swift                    0x000000010dfb4306 swift::ModuleFile::getDecl(llvm::Fixnum<31u, unsigned int>, llvm::Optional<swift::DeclContext*>) + 11238
16 swift                    0x000000010dfd198b swift::ModuleFile::getTopLevelDecls(llvm::SmallVectorImpl<swift::Decl*>&) + 955
17 swift                    0x000000010dffb246 swift::serialization::Serializer::writeAST(llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>) + 646
18 swift                    0x000000010dffdf87 swift::serialization::Serializer::writeToStream(llvm::raw_ostream&, llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, swift::SILModule const*, swift::SerializationOptions const&) + 135
19 swift                    0x000000010dffebb2 withOutputFile(swift::ASTContext&, llvm::StringRef, llvm::function_ref<void (llvm::raw_ostream&)>) + 226
20 swift                    0x000000010dffea36 swift::serialize(llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, swift::SerializationOptions const&, swift::SILModule const*) + 214
21 swift                    0x000000010dc97828 performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&) + 12840
22 swift                    0x000000010dc943f3 frontend_main(llvm::ArrayRef<char const*>, char const*, void*) + 2691
23 swift                    0x000000010dc90a74 main + 2324
24 libdyld.dylib            0x00007fff937c85ad start + 1
Stack dump:
0.	Program arguments: /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -emit-module /var/folders/9y/f7n4rvx901nctm_5d16c1wm40000gn/T/boom-94824a.swiftmodule -parse-as-library -target x86_64-apple-darwin15.0.0 -enable-objc-interop -sdk /Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk -emit-module-doc-path boom.swiftdoc -color-diagnostics -module-name boom -o boom.swiftmodule 
1.	While reading from /var/folders/9y/f7n4rvx901nctm_5d16c1wm40000gn/T/boom-94824a.swiftmodule
2.	While deserializing decl #5 (ENUM_DECL)
3.	While deserializing 'F' (GenericTypeParamDecl #13) 
4.	While deserializing decl #14 (TYPE_ALIAS_DECL)
5.	While deserializing decl #5 (ENUM_DECL)
<unknown>:0: error: unable to execute command: Segmentation fault: 11
<unknown>:0: error: merge-module command failed due to signal (use -v to see invocation)


Regression:
swiftc doesn’t crash if you omit -emit-module.


Notes:
N/A