[perl #127528] [BUG] Regex Capture groups contain ??

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# New Ticket Created by  Boris Möbus 
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Version
>>perl -v
This is Rakudo version 2016.01.1 built on MoarVM version 2016.01
implementing Perl 6.c.

Behaviour:
> say so 'abc' ~~ / (\w+) . /;
True
> $0
?ab?

Should be (last two lines):
>$0
ab