C<before> and <after> being zero width assertions , I think they must
always be called with
a question mark. This is not the case line 394 and 1537.
Perljam  suggested that a zero width assertion can be also a capturing
one and that
could explain the dropping of the question mark. I don't agree with
that suggestion.
Anyway the examples given line 394 and 1537 don't involve capture.

This was discussed in #perl6 starting 
http://irclog.perlgeek.de/perl6/2008-06-20#i_357271

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