Took some hacking to get working since recently in go the way to convert a String into a series of Bytes changed:

There is one language change: the ability to convert a string to
[]byte or []int.  This deprecates the strings.Bytes and strings.Runes
functions. You can convert your existing sources using these gofmt
commands:

gofmt -r 'strings.Bytes(x) -> []byte(x)' -w file-or-directory-list
gofmt -r 'strings.Runes(x) -> []int(x)' -w file-or-directory-list

After running these you might need to delete unused imports of the
"strings" package.

Fixed now and works on my machine™, granted you put semicolons at the end of lines in the REPL.