Swift compiler segmentation fault when building

Question

Adding a (convenient) computed height property to UIView in my UIViewExtension.swift file is causing the Swift compiler to segfault... What could possibly be going wrong here?

0  swift                    0x00000001061e5608 llvm::sys::PrintStackTrace(__sFILE*) + 40 1  swift                    0x00000001061e5af4 SignalHandler(int) + 452 2  libsystem_platform.dylib 0x00007fff894da5aa _sigtramp + 26 3  libsystem_platform.dylib 0xb03939841e997c88 _sigtramp + 2504775416 4  swift                    0x00000001064c8bb9 swift::NominalTypeDecl::getMembers(bool) const + 41 5  swift                    0x00000001055efab9 swift::irgen::ClassMetadataLayout<(anonymous namespace)::FindClassMethodIndex>::addClassMembers(swift::ClassDecl*) + 329 6  swift                    0x00000001055e97b2 swift::irgen::emitVirtualMethodValue(swift::irgen::IRGenFunction&, llvm::Value*, swift::SILType, swift::SILDeclRef, swift::CanTypeWrapper<swift::SILFunctionType>, swift::ResilienceExpansion) + 434 7  swift                    0x00000001056550d3 swift::SILVisitor<(anonymous namespace)::IRGenSILFunction, void>::visit(swift::ValueBase*) + 42611 8  swift                    0x000000010564a266 swift::irgen::IRGenModule::emitSILFunction(swift::SILFunction*) + 8678 9  swift                    0x00000001055cb6f8 swift::irgen::IRGenModule::emitGlobalTopLevel() + 184 10 swift                    0x00000001056376e3 performIRGeneration(swift::IRGenOptions&, swift::Module*, swift::SILModule*, llvm::StringRef, llvm::LLVMContext&, swift::SourceFile*, unsigned int) + 1859 11 swift                    0x0000000105638033 swift::performIRGeneration(swift::IRGenOptions&, swift::SourceFile&, swift::SILModule*, llvm::StringRef, llvm::LLVMContext&, unsigned int) + 51 12 swift                    0x00000001055aa65a frontend_main(llvm::ArrayRef<char const*>, char const*, void*) + 4842 13 swift                    0x00000001055a935d main + 1533 14 libdyld.dylib            0x00007fff8a82e5fd start + 1 

 

1.  While emitting IR SIL function @_TFCSo6UIViewg6heightSd for 'anonname=0x7ff422892fd0' at <path redacted>/UIViewExtension.swift:60:5 <unknown>:0: error: unable to execute command: Segmentation fault: 11 <unknown>:0: error: swift frontend command failed due to signal (use -v to see invocation) Command /Applications/Xcode6-Beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift failed with exit code 254 

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Edit:

Here's a related .xcodeproj that returns this question's compiler error. Download here

Answer 1

I had this error because I was doing this :

if(currentMeal?.State == .Deleted){  } 

instead of

if(currentMeal!.State == .Deleted){  } 

so I think optional not unwrapped in if condition can cause this error