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    my $test_output;
    my $IO = IO::Scalar->new(\$test_output);
...
    };
    $test_output .= $@ if ($@);
    select(STDOUT);

    my $test_output;
    tie(*STDOUT, 'IO::Scalar', \$test_output);
...
    };
    $test_output .= $@ if ($@);
    untie(*STDOUT);