I’m looking into this. This appears to be an artefact of .gist on the list, caused by the say. Which also happens for .perl on the list.
say $/.list.Str; # a c Suspecting the gistseen/perlseen machinery now. Investigating... > On 18 Sep 2016, at 19:30, Sam S. (via RT) <perl6-bugs-follo...@perl.org> > wrote: > > # New Ticket Created by Sam S. > # Please include the string: [perl #129299] > # in the subject line of all future correspondence about this issue. > # <URL: https://rt.perl.org/Ticket/Display.html?id=129299 > > > > When a quantified capture group matched zero times but the overall regex > matches, then the List returned from `$/.list` stops iterating before the > corresponding element: > > "ac" ~~ / (a) (b)? (c) /; > say ($0, $1, $2); # (｢a｣ Nil ｢c｣) > say $/.list; # (｢a｣) > say $/.list.map({1}); # (1) > say $/.list.elems; # 3 > say $/.list[0, 1, 2, 3]; # (｢a｣ (Mu) ｢c｣ Nil > > Expected behavior would be for `$/.list;` to return `(｢a｣ Nil ｢c｣)`. > > mst++ suggested that maybe an InterationEnd is ending up where it shouldn't > be.
