[perl #123956] [BUG] [LHF] multi-name parameter parsing too strict

[Christian Bartolomaeus via RT]

This was fixed with commit https://github.com/rakudo/rakudo/commit/7a9a4cadeb.

I added a test to S06-signature/named-renaming.t with commit 
https://github.com/perl6/roast/commit/459be82454.

I'm closing this ticket as 'resolved'.