[swift-dev] Compiler crash - relates to protocol and protocol extension

[Jasl]

Hi,

I found a piece of code that could made the compiler crash, It’s can reproduce on Xcode 7.2(7C68) with Apple Swift version 2.1.1 (swiftlang-700.1.101.15 clang-700.1.81) Target: x86_64-apple-darwin15.2.0

the code is simply like:

protocol FooType {
  func bar(b: Int)
}

extension FooType {
  func bar(a: Int, b: Int) {
  }
}

struct Foo: FooType {
  
}

Even the function’s default implementation signature in protocol extension is different with its definition in protocol, it can compiling successful with no error, but when compiling Foo, the compiler will crash, the stack is like:

0  swift                    0x0000000110dbcfbb llvm::sys::PrintStackTrace(__sFILE*) + 43
1  swift                    0x0000000110dbd6fb SignalHandler(int) + 379
2  libsystem_platform.dylib 0x00007fff996feeaa _sigtramp + 26
3  libsystem_platform.dylib 0x00007f9fa3aa12a8 _sigtramp + 171582488
4  swift                    0x000000010f083707 swift::SILWitnessVisitor<(anonymous namespace)::SILGenConformance>::visitProtocolDecl(swift::ProtocolDecl*) + 999
5  swift                    0x000000010f080ee5 swift::Lowering::SILGenModule::getWitnessTable(swift::ProtocolConformance*) + 277
6  swift                    0x000000010f0d05b0 (anonymous namespace)::SILGenType::emitType() + 1264
7  swift                    0x000000010f0d12d1 SILGenExtension::visitNominalTypeDecl(swift::NominalTypeDecl*) + 33
8  swift                    0x000000010f0d0d4b SILGenExtension::emitExtension(swift::ExtensionDecl*) + 59
9  swift                    0x000000010f0d06f5 swift::Lowering::SILGenModule::visitExtensionDecl(swift::ExtensionDecl*) + 21
10 swift                    0x000000010f058bdb swift::Lowering::SILGenModule::emitSourceFile(swift::SourceFile*, unsigned int) + 779
11 swift                    0x000000010f059790 swift::SILModule::constructSIL(swift::ModuleDecl*, swift::SILOptions&, swift::FileUnit*, llvm::Optional<unsigned int>, bool, bool) + 928
12 swift                    0x000000010f059b3d swift::performSILGeneration(swift::FileUnit&, swift::SILOptions&, llvm::Optional<unsigned int>, bool) + 109
13 swift                    0x000000010eead992 performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&) + 11442
14 swift                    0x000000010eeaaad3 frontend_main(llvm::ArrayRef<char const*>, char const*, void*) + 2691
15 swift                    0x000000010eea7154 main + 2324
16 libdyld.dylib            0x00007fff8c66c5ad start + 1

Please check.

thank you!

-- 
Jasl
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