I'm happy, but surprised to see this out there. I thought he had run into a problem with regexes not being re-entrant (a problem which is very frustrating, I might add). I'll have to peer under the hood and see what he did.

Ooh, I see an interesting note in the docs. I wonder if this is related:

Due to bugs in the Perl 5 regex engine, captures that occur in rules or subrules called in from other grammatical namespaces may not work correctly under Perl6::Rules, and will frequently lead to segfaults and bus errors.