error output:
/usr/bin/swift[0x3f24d54] /usr/bin/swift[0x3f25096] /lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f2d23306390] /usr/bin/swift[0x4c55c0] /usr/bin/swift[0x4c3a83] /usr/bin/swift[0x4beecc] /usr/bin/swift[0x4778c4] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f2d21a30830] /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