[v6.d REVIEW] Move overly-vague error text test to impl
[v6.d REVIEW] Move overly-vague error text test to impl

Orig: https://github.com/perl6/roast/commit/e1704aa62
Moved to: https://github.com/rakudo/rakudo/commit/f8f4ae3183

dogbert17/roast,perl6/roast,dogbert17/roast