test/Index/Inputs/Headers/crash.h - third_party/swift-clang - Git at Google

 // Produce a crash if CRASH is defined.
 #ifdef CRASH
 #  pragma clang __debug crash
 #endif

 const char *getCrashString();
	// Produce a crash if CRASH is defined.
	#ifdef CRASH
	# pragma clang __debug crash
	#endif

	const char *getCrashString();