[perl #132191] [REGRESSION] Possible rakudo regression (issues with IRC::Client)

[Zoffix Znet via RT]

Turned out IRC::Client's grammar is relying on a bug with `:ratchet` being 
ignored in || which was fixed as part of 
https://rt.perl.org/Ticket/Display.html?id=130117

IRC: https://irclog.perlgeek.de/perl6-dev/2017-10-20#i_15331049