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19|ifthenelse|>>Matched action<< (return value: []) |
19|ifthenelse|>>Matched production: [if elsif else  |
...
19|ifthenelse|>>Matched rule<< (return value:       |
  |          |[ARRAY(0x870cb08)])                   |
19|ifthenelse|(consumed: [])                        |

if stw!=0 then stw else 1.40 * 1e-6  endif

expr: ifthenelse
      { $return = main::evaluate($main::c_v, @item); }
...
        { if ($item[2]) { $return = $item[4] } else { $return = 'NIL' 
+} }

endif:          /endif/i { $return = 'NIL'; }

sub evaluate
{
...
    return $value;
    }
}

21|   expr   |>>Matched action<< (return value:     |
...
20|   else   |(consumed: [ else 1.40 * 1e-6])       |
19|ifthenelse|>>Matched repeated subrule: [else]<<  |
  |          |(1 times)