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  1. or download this
    foo *
routine(a, b, c=NULL)
...
    c : cdefault );
 OUTPUT: RETVAL
  2. or download this
     my $c = $objref;
 routine( $a, $b, $c);
  3. or download this
     routine( $a, $b);
  4. or download this
      my $c;
  $c = $objref if( false );
  routine( $a, $b, $c );