use Test; #| reverse the zip operation sub reverse-zip(@list-of-tuples) { [Z] @list-of-tuples } my @l1 = 1, 2, 3; my @l2 = <a b c>; my @input = zip @l1, @l2; my @expected-output = @l1, @l2; # we need to convert all elements of @expected-output to lists # otherwise we get an error is-deeply reverse-zip(@input), @expected-output; is-deeply reverse-zip(@input), @expected-output».List;