Swift Profile Coverage Mapping Ternary Compiler Crashes

Crash.log

0  swift                    0x0000000105bbc33b llvm::sys::PrintStackTrace(__sFILE*) + 43
1  swift                    0x0000000105bbca7b SignalHandler(int) + 379
2  libsystem_platform.dylib 0x00007fff8b24052a _sigtramp + 26
3  libc++.1.dylib           0x00007fff8f4d93c6 std::__1::num_put<char, std::__1::ostreambuf_iterator<char, std::__1::char_traits<char> > >::do_put(std::__1::ostreambuf_iterator<char, std::__1::char_traits<char> >, std::__1::ios_base&, char, unsigned long) const + 0
4  swift                    0x00000001042f05da swift::Expr::walk(swift::ASTWalker&) + 26
5  swift                    0x0000000103ec7951 walkForProfiling(swift::AbstractFunctionDecl*, swift::ASTWalker&) + 225
6  swift                    0x0000000103ec732d swift::Lowering::SILGenProfiling::assignRegionCounters(swift::AbstractFunctionDecl*) + 573
7  swift                    0x0000000103ed265d (anonymous namespace)::SILGenType::emitType() + 701
8  swift                    0x0000000103ed232e swift::Lowering::SILGenModule::visitNominalTypeDecl(swift::NominalTypeDecl*) + 30
9  swift                    0x0000000103e5ae0b swift::Lowering::SILGenModule::emitSourceFile(swift::SourceFile*, unsigned int) + 779
10 swift                    0x0000000103e5b9c0 swift::SILModule::constructSIL(swift::ModuleDecl*, swift::SILOptions&, swift::FileUnit*, llvm::Optional<unsigned int>, bool, bool) + 928
11 swift                    0x0000000103e5bd6d swift::performSILGeneration(swift::FileUnit&, swift::SILOptions&, llvm::Optional<unsigned int>, bool) + 109
12 swift                    0x0000000103cafb92 performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&) + 11442
13 swift                    0x0000000103caccd3 frontend_main(llvm::ArrayRef<char const*>, char const*, void*) + 2691
14 swift                    0x0000000103ca9354 main + 2324
15 libdyld.dylib            0x00007fff8a0f55ad start + 1
16 libdyld.dylib            0x0000000000000011 start + 1978706533
Stack dump:
0.	Program arguments: /Applications/Xcode.a

Test.swift

import Foundation

class MyClass {
    var aTernary = NSDate() == NSDate(timeIntervalSinceNow: 20) ? "true" : "false"

    //lazy var workingTernary: String = NSDate() == NSDate(timeIntervalSinceNow: 20) ? "true" : "false"
}

Thanks for posting this, it helped me debug a crash of my own.

Was a bug or radar submitted for this crash?

rdar://23256795