[perl #68110] [BUG] Defaults are not respected in signatures in Rakudo for loops

[Carl Mäsak]

# New Ticket Created by  "Carl Mäsak" 
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<masak> rakudo: my @a = 1,2,3; for @a -> $a, $b = 5 { say $a, "\t", $b }
<p6eval> rakudo e02bc0: OUTPUT«1  2␤StopIteration␤ [...]
<masak> that can't be right.
<jnthn> Rakudo bug.
* masak submits
<masak> rakudo: my @a = 1,2,3,4; for @a -> $a, $b = 5 { say $a, "\t", $b }
<p6eval> rakudo e02bc0: OUTPUT«1  2␤3      4␤»
<masak> that's part of the bug.