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use strict;
use warnings;
...
}

#no

given (@arr) {
    when (()) {say "The array is empty."}
    when (34) {say "The array contains 34."}
    default {say "Something else."}
}

given (@arr) {
    my @empty = ()
...
    when (34) {say "The array contains 34."}
    default {say "Something else."}
}

my @arr1 = (2, 34);
say "34" if @arr1 ~~ 34;

#no output...??

my @arr1 = ('hello', 'goodbye');
say "array size is 2" if @arr1 ~~ 2;

#no output