Thank you all. I have already got the answer from your replies.

I know that I can't take reference to the return value of a subroutine directly. But I want to know why? Here is an example.

sub foo{
  return (0, 1);
}

my $var = \(foo());  # $var is not a reference to the array (0, 1).

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In reply to Reference to return value of a subroutine by Christina

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