Open Radar

 
Summary:
I have a literal closure that I'm passing as a C function pointer to a C API. This is happening inside a the init method of a generic class. The compiler crashes while emitting SIP. It doesn't crash if the class is not generic.

Steps to Reproduce:
1. Install Xcode Version 7.2 beta (7C46l)
2. Create an OS X command-line project and paste the code in main.swift (14 lines)
3. Compile

Expected Results:
Successful compile

Actual Results:
Compiler crashes with errors attached in errors.txt

Version:
Xcode Version 7.2 beta (7C46l)
OS X 10.11.1


---
main.swift
---
import Cocoa

class Observer<ElementType> {
  init() {
    var axObserver: AXObserver?
    let _ = AXObserverCreate(0, {(
      axObserver: AXObserver,
      axElement: AXUIElement,
      notification: CFString,
      userData: UnsafeMutablePointer<Void>) in
      // do nothing
      }, &axObserver)
  }
}

---
errors.txt
---
CompileSwift normal x86_64 /Users/tyler/code/testcase2/testcase2/main.swift
cd /Users/tyler/code/testcase2
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -c -primary-file /Users/tyler/code/testcase2/testcase2/main.swift -target x86_64-apple-macosx10.11 -enable-objc-interop -sdk /Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk -I /Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Products/Debug -F /Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Products/Debug -enable-testing -g -module-cache-path /Users/tyler/Library/Developer/Xcode/DerivedData/ModuleCache -serialize-debugging-options -Xcc -I/Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/swift-overrides.hmap -Xcc -iquote -Xcc /Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/testcase2-generated-files.hmap -Xcc -I/Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/testcase2-own-target-headers.hmap -Xcc -I/Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/testcase2-all-target-headers.hmap -Xcc -iquote -Xcc /Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/testcase2-project-headers.hmap -Xcc -I/Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Products/Debug/include -Xcc -I/Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/DerivedSources/x86_64 -Xcc -I/Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/DerivedSources -Xcc -DDEBUG=1 -Xcc -working-directory/Users/tyler/code/testcase2 -emit-module-doc-path /Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/Objects-normal/x86_64/main~partial.swiftdoc -Onone -module-name testcase2 -emit-module-path /Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/Objects-normal/x86_64/main~partial.swiftmodule -serialize-diagnostics-path /Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/Objects-normal/x86_64/main.dia -emit-dependencies-path /Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/Objects-normal/x86_64/main.d -emit-reference-dependencies-path /Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/Objects-normal/x86_64/main.swiftdeps -o /Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/Objects-normal/x86_64/main.o

0  swift                    0x0000000110db9f7b llvm::sys::PrintStackTrace(__sFILE*) + 43
1  swift                    0x0000000110dba6bb SignalHandler(int) + 379
2  libsystem_platform.dylib 0x00007fff86b4052a _sigtramp + 26
3  libsystem_platform.dylib 0x0000001d00726573 _sigtramp + 2042519651
4  swift                    0x000000010ef87b7b swift::irgen::emitPolymorphicArguments(swift::irgen::IRGenFunction&, swift::CanTypeWrapper<swift::SILFunctionType>, swift::CanTypeWrapper<swift::SILFunctionType>, llvm::ArrayRef<swift::Substitution>, swift::irgen::WitnessMetadata*, swift::irgen::Explosion&) + 587
5  swift                    0x000000010efd477c (anonymous namespace)::IRGenSILFunction::visitFullApplySite(swift::FullApplySite) + 2172
6  swift                    0x000000010efc627d swift::irgen::IRGenModule::emitSILFunction(swift::SILFunction*) + 10973
7  swift                    0x000000010ef2c923 swift::irgen::IRGenModuleDispatcher::emitLazyDefinitions() + 307
8  swift                    0x000000010efacd6a performIRGeneration(swift::IRGenOptions&, swift::ModuleDecl*, swift::SILModule*, llvm::StringRef, llvm::LLVMContext&, swift::SourceFile*, unsigned int) + 1034
9  swift                    0x000000010efad100 swift::performIRGeneration(swift::IRGenOptions&, swift::SourceFile&, swift::SILModule*, llvm::StringRef, llvm::LLVMContext&, unsigned int) + 64
10 swift                    0x000000010eeabb35 performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&) + 13701
11 swift                    0x000000010eea83a3 frontend_main(llvm::ArrayRef<char const*>, char const*, void*) + 2691
12 swift                    0x000000010eea4a24 main + 2324
13 libdyld.dylib            0x00007fff927d95ad start + 1
14 libdyld.dylib            0x000000000000003a start + 1837263502
Stack dump:
0.	Program arguments: /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -c -primary-file /Users/tyler/code/testcase2/testcase2/main.swift -target x86_64-apple-macosx10.11 -enable-objc-interop -sdk /Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk -I /Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Products/Debug -F /Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Products/Debug -enable-testing -g -module-cache-path /Users/tyler/Library/Developer/Xcode/DerivedData/ModuleCache -serialize-debugging-options -Xcc -I/Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/swift-overrides.hmap -Xcc -iquote -Xcc /Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/testcase2-generated-files.hmap -Xcc -I/Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/testcase2-own-target-headers.hmap -Xcc -I/Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/testcase2-all-target-headers.hmap -Xcc -iquote -Xcc /Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/testcase2-project-headers.hmap -Xcc -I/Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Products/Debug/include -Xcc -I/Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/DerivedSources/x86_64 -Xcc -I/Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/DerivedSources -Xcc -DDEBUG=1 -Xcc -working-directory/Users/tyler/code/testcase2 -emit-module-doc-path /Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/Objects-normal/x86_64/main~partial.swiftdoc -Onone -module-name testcase2 -emit-module-path /Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/Objects-normal/x86_64/main~partial.swiftmodule -serialize-diagnostics-path /Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/Objects-normal/x86_64/main.dia -emit-dependencies-path /Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/Objects-normal/x86_64/main.d -emit-reference-dependencies-path /Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/Objects-normal/x86_64/main.swiftdeps -o /Users/tyler/Library/Developer/Xcode/DerivedData/testcase2-gujsabtuvlwakmakyxkeygwreirz/Build/Intermediates/testcase2.build/Debug/testcase2.build/Objects-normal/x86_64/main.o
1.	While emitting IR SIL function @_TToFFC9testcase28ObservercurFMGS0_q__FT_GS0_q__U_FTCSo10AXObserverCSo11AXUIElementCSo8CFStringGVSs20UnsafeMutablePointerT___T_ for expression at [/Users/tyler/code/testcase2/testcase2/main.swift:6:33 - line:12:7] RangeText="{(
axObserver: AXObserver,
axElement: AXUIElement,
notification: CFString,
userData: UnsafeMutablePointer<Void>) in
// do nothing
}"