Test `does` can be used with non-composable :D RHS
Test `does` can be used with non-composable :D RHS

Rakudo impl: https://github.com/rakudo/rakudo/commit/575d31e251

(Couldn't find where the `infix:<does>` is tested so stuck new
tests here)

perl6/roast,dogbert17/roast,dogbert17/roast