[v6.d REVIEW] Reword IO::Path.new with wrong args test
[v6.d REVIEW] Reword IO::Path.new with wrong args test

Don't block taking positional args in the future; test we don't
throw the "named only" exception instead.

Orig: https://github.com/perl6/roast/commit/5f5469580

perl6/roast,dogbert17/roast,dogbert17/roast