[perl #60780] Trouble when iteration variables don't add up

[Carl Mäsak]

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<masak> rakudo: for 1..5 -> $a, $b { say $a, $b }
<p6eval> rakudo 33137: OUTPUT[12␤34␤StopIteration␤current instr.:
'_block11' pc 78 (EVAL_15:29)␤]

I haven't searched the specs or the tests for what should happen, but
I'm pretty sure this shouldn't throw an exception.