can't load package: package main: 
/in/foo.go:1:1: expected 'package', found 'IDENT' def
/in/foo.go:2:3: illegal character U+0024 '$'
/in/foo.go:4:3: illegal character U+0024 '$'
/in/foo.go:5:17: illegal character U+0024 '$'
/in/foo.go:8:36: illegal character U+0024 '$'
/in/foo.go:11:23: illegal rune literal
/in/foo.go:19:6: illegal rune literal
/in/foo.go:19:16: illegal rune literal
/in/foo.go:28:1: illegal character U+0024 '$'
/in/foo.go:28:13: illegal rune literal