If @test is a 2d array, then passing $test[2] to the subroutine passes an array reference, not an array. To pass the array, you have to dereference it: 
@a = permutations(@{ $test[2] });

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See perllol - Manipulating Arrays of Arrays in Perl for details.

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In reply to Re: Problem with passing array in a sub by choroba
in thread Problem with passing array in a sub by SHKVal

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