[perl #125521] Braced form of ** quantifier not handling captured matches correctly

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# New Ticket Created by  Faye 
# Please include the string:  [perl #125521]
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# <URL: https://rt.perl.org/Ticket/Display.html?id=125521 >


$ perl6 -e 'say "AAA" ~~ /$<letter>=(A)+/'
｢AAA｣
 letter => ｢A｣
 letter => ｢A｣
 letter => ｢A｣

$ perl6 -e 'say "AAA" ~~ /$<letter>=(A)**3/'
｢AAA｣
 letter => ｢A｣
 letter => ｢A｣
 letter => ｢A｣

$ perl6 -e 'say "AAA" ~~ /$<letter>=(A)**{3}/'
｢AAA｣
 letter => ｢AAA｣

The braced version of ** stores all the matches of the capture it quantifies 
under one capture, instead of an array of captures like other quantifiers do 
(including brace-less **)