gcc compiles the following program, while gc and go/types reject it: ``` go package G //line \FF:8 ``` (that \FF needs to be converted to actual FF byte) gc and go/types say: ``` go.go:2:8: illegal UTF-8 encoding go.go:2: illegal UTF-8 sequence ff 3a ``` Compilers should agree on validity of this program. gcc version 6.0.0 20150702 (experimental) (GCC)