exit status: 4, error output:
#0 0x0000000003f24d54 PrintStackTraceSignalHandler(void*) (/usr/bin/swift+0x3f24d54) #1 0x0000000003f25096 SignalHandler(int) (/usr/bin/swift+0x3f25096) #2 0x00007fcd052c1390 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x11390) #3 0x00000000004c55c0 debugFailWithCrash() (/usr/bin/swift+0x4c55c0) #4 0x00000000004c3a83 performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&, swift::FrontendObserver*, swift::UnifiedStatsReporter*) (/usr/bin/swift+0x4c3a83) #5 0x00000000004beecc swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) (/usr/bin/swift+0x4beecc) #6 0x00000000004778c4 main (/usr/bin/swift+0x4778c4) #7 0x00007fcd039eb830 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x20830) #8 0x0000000000475179 _start (/usr/bin/swift+0x475179) Stack dump: 0. Program arguments: /usr/bin/swift -frontend -interpret main.swift -disable-objc-interop -debug-crash-after-parse -module-name main