Normally your code returns 0 on failure. But when you're debugging, you want to bomb out:

$DEBUG_LEVEL = 1;

$DEBUG = $DEBUG_LEVEL ? sub {croak "$! $@";} : sub { 0; };

sub foo {

    do_something;

    if ($argh) {return &$DEBUG} 
    return 1;
}

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In reply to debug closure by dash2

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