import Foundation

protocol SomeProtocol { }

class OtherClass {
    unowned var obj: NSObject & SomeProtocol
    
    init(obj: NSObject & SomeProtocol) {
        self.obj = obj
    }
}

➜  swift-crash swift build
Compile Swift Module 'swift_crash' (1 sources)
Invalid InsertValueInst operands!
  %12 = insertvalue { %TSo8NSObjectC*, i8** } undef, %objc_object* %8, 0, !dbg !64
<unknown>:0: error: fatal error encountered during compilation; please file a bug report with your project and the crash log
<unknown>:0: note: Broken function found, compilation aborted!
0  swift                    0x000000010945fffa PrintStackTraceSignalHandler(void*) + 42
1  swift                    0x000000010945f3b6 SignalHandler(int) + 966
2  libsystem_platform.dylib 0x00007fff65557f5a _sigtramp + 26
3  libsystem_platform.dylib 0x00007ffeea1be130 _sigtramp + 2227593712
4  libsystem_c.dylib        0x00007fff652f51ae abort + 127
5  swift                    0x0000000105ab68e7 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*)::$_0::__invoke(void*, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, bool) + 519
6  swift                    0x0000000109417658 llvm::report_fatal_error(llvm::Twine const&, bool) + 280
7  swift                    0x0000000109417539 llvm::report_fatal_error(char const*, bool) + 41
8  swift                    0x00000001093dfca6 (anonymous namespace)::VerifierLegacyPass::runOnFunction(llvm::Function&) + 54
9  swift                    0x00000001093877d1 llvm::FPPassManager::runOnFunction(llvm::Function&) + 449
10 swift                    0x000000010938f703 llvm::legacy::FunctionPassManagerImpl::run(llvm::Function&) + 115
11 swift                    0x000000010938f5fc llvm::legacy::FunctionPassManager::run(llvm::Function&) + 396
12 swift                    0x0000000105c5fa18 swift::performLLVM(swift::IRGenOptions&, swift::DiagnosticEngine*, llvm::sys::SmartMutex<false>*, llvm::GlobalVariable*, llvm::Module*, llvm::TargetMachine*, swift::version::Version const&, llvm::StringRef, swift::UnifiedStatsReporter*) + 5096
13 swift                    0x0000000105ac177d performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&, swift::FrontendObserver*, swift::UnifiedStatsReporter*) + 44685
14 swift                    0x0000000105ab4e64 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 7908
15 swift                    0x0000000105a698b5 main + 18917
16 libdyld.dylib            0x00007fff65249015 start + 1
Stack dump:
0.  Program arguments: /Applications/Xcode-9.3.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -c -primary-file /Users/simon/Desktop/swift-crash/Sources/swift-crash/main.swift -target x86_64-apple-macosx10.10 -enable-objc-interop -sdk /Applications/Xcode-9.3.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk -I /Users/simon/Desktop/swift-crash/.build/x86_64-apple-macosx10.10/debug -F /Applications/Xcode-9.3.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -enable-testing -g -module-cache-path /Users/simon/Desktop/swift-crash/.build/x86_64-apple-macosx10.10/debug/ModuleCache -swift-version 4 -Onone -D SWIFT_PACKAGE -color-diagnostics -emit-module-doc-path /Users/simon/Desktop/swift-crash/.build/x86_64-apple-macosx10.10/debug/swift_crash.build/main~partial.swiftdoc -module-name swift_crash -emit-module-path /Users/simon/Desktop/swift-crash/.build/x86_64-apple-macosx10.10/debug/swift_crash.build/main~partial.swiftmodule -emit-dependencies-path /Users/simon/Desktop/swift-crash/.build/x86_64-apple-macosx10.10/debug/swift_crash.build/main.d -emit-reference-dependencies-path /Users/simon/Desktop/swift-crash/.build/x86_64-apple-macosx10.10/debug/swift_crash.build/main.swiftdeps -num-threads 8 -o /Users/simon/Desktop/swift-crash/.build/x86_64-apple-macosx10.10/debug/swift_crash.build/main.swift.o 
1.  Running pass 'Module Verifier' on function '@_T011swift_crash10OtherClassC3objAA12SomeProtocol_So8NSObjectCXcXovg'
<unknown>:0: error: unable to execute command: Abort trap: 6
<unknown>:0: error: compile command failed due to signal 6 (use -v to see invocation)
error: terminated(1): /Applications/Xcode-9.3.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-build-tool -f /Users/simon/Desktop/swift-crash/.build/debug.yaml main output: