This is likely a regression from the glr branch being merged into the main branch this morning. Hopefully any issues with the Perl 6 ecosystem will we worked out shortly. Actually, in the IRC channel[1], I see some module authors already making commits to adapt to the changes.

1: If you just want to lurk, or catch up on a past day, you can view the log at http://irclog.perlgeek.de/perl6/today