runtime/JavaScript/tests/functional/t049treeparserhWalker.g

// @@ANTLR Tool Options@@: -trace
tree grammar t049treeparserhWalker;
options {
    language=JavaScript;
    ASTLabelType=CommonTree;
}
a : ^(ID INT? b) SEMI
    {this.capture($ID+", "+$b.text);}
  ;
b : ID? ;