exit status: 134 with stderr:
<stdin>:8:9: warning: 'is' test is always true print(a is Foo) ^ warning: Swift runtime does not yet support dynamically querying conditional conformance ('Swift.Array<Swift.Int>': 'main.Foo') Could not cast value of type 'Swift.Array<Swift.Int>' (0x7f1e0cfb7240) to 'main.Foo' (0x7f1e0cfb7280). #0 0x0000000003f25074 PrintStackTraceSignalHandler(void*) (/usr/bin/swift+0x3f25074) #1 0x0000000003f253b6 SignalHandler(int) (/usr/bin/swift+0x3f253b6) #2 0x00007f1e11cc7390 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x11390) #3 0x00007f1e10406428 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x35428) #4 0x00007f1e1040802a abort (/lib/x86_64-linux-gnu/libc.so.6+0x3702a) #5 0x00007f1e0ce92fd3 (/usr/lib/swift/linux/libswiftCore.so+0x39dfd3) #6 0x00007f1e0ce8f599 (/usr/lib/swift/linux/libswiftCore.so+0x39a599) #7 0x00007f1e0ce8f5eb (/usr/lib/swift/linux/libswiftCore.so+0x39a5eb) #8 0x00007f1e0ce90b38 _dynamicCastToExistential(swift::OpaqueValue*, swift::OpaqueValue*, swift::TargetMetadata<swift::InProcess> const*, swift::TargetExistentialTypeMetadata<swift::InProcess> const*, swift::DynamicCastFlags) (/usr/lib/swift/linux/libswiftCore.so+0x39bb38) #9 0x00007f1e120f624d #10 0x00007f1e120f610e #11 0x0000000000fed3be llvm::MCJIT::runFunction(llvm::Function*, llvm::ArrayRef<llvm::GenericValue>) (/usr/bin/swift+0xfed3be) #12 0x0000000000ff1882 llvm::ExecutionEngine::runFunctionAsMain(llvm::Function*, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&, char const* const*) (/usr/bin/swift+0xff1882) #13 0x00000000004d9076 swift::RunImmediately(swift::CompilerInstance&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&, swift::IRGenOptions&, swift:
stderr.txt
https://file.io/o6Pj9X