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      1 // @@ANTLR Tool Options@@: -trace
      2 tree grammar t049treeparserbWalker;
      3 options {
      4     language=JavaScript;
      5     ASTLabelType=CommonTree;
      6 }
      7 a : ^(ID INT)
      8     {this.capture($ID+", "+$INT)}
      9   ;
     10