map  { [ $_, expensive($_) } @unsorted

Note that this expression should be
    map { [ $_, expensive($_) ] } @unsorted
(missing right-square-bracket) or even
    map [ $_, expensive($_) ], @unsorted
(needs extra comma).

Give a man a fish:  <%-(-(-(-<

In reply to Re^5: I can crash perl by AnomalousMonk
in thread I can crash perl by mark4

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