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  1. or download this
    use Carp 'clue';
$::DEBUG = 1; # to enable Clueing.
...
clue 'scalar';
  2. or download this
    use vars qw/$DEBUG/;
  3. or download this
    
73:-+     @EXPORT_OK = qw(cluck verbose clue);
123 +    sub clue    { warn longmess     @_ if $::DEBUG; }