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  1. or download this
    use v5.8.0;
    my $stderr;
    ...
       warn("foo\n");                    # no output
    }
    print STDERR ("\$stderr: $stderr");  # $stderr: foo
    
  2. or download this
    use v5.8.0;
    my $stderr;
    ...
    };
    print STDERR ("\$stderr: $stderr");  # $stderr: foo
    die($@) if $@;                       # bar