22941964: Swift: swiftc crash emitting module with type constraint using typealias in constrained type

[openradar-mirror]

Description

Summary:
N/A

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

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::SmallPtrSetImplswift::ArchetypeType*&, llvm::SmallVectorImplswift::ArchetypeType*&) + 30
5 swift 0x000000010e3240c3 swift::GenericParamList::deriveAllArchetypes(llvm::ArrayRefswift::GenericTypeParamDecl*, llvm::SmallVectorImplswift::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::Optionalswift::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::Optionalswift::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::Optionalswift::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::Optionalswift::DeclContext*) + 11238
16 swift 0x000000010dfd198b swift::ModuleFile::getTopLevelDecls(llvm::SmallVectorImplswift::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 22108118: Apple Music: No Love Icon On CarPlay #5 (ENUM_DECL)
3. While deserializing 'F' (GenericTypeParamDecl 22105831: Application windows move erratically with two monitors #13)
4. While deserializing decl 22105625: Mac OS X 10.11: Battery status alwasy shows "20:00 Remaining" #14 (TYPE_ALIAS_DECL)
5. While deserializing decl 22108118: Apple Music: No Love Icon On CarPlay #5 (ENUM_DECL)
   :0: error: unable to execute command: Segmentation fault: 11
   :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

Product Version: Xcode 7.0 (7A1001)
Created: 2015-10-01T22:25:15.799050
Originated: 2015-10-01T18:24:00
Open Radar Link: http://www.openradar.me/22941964