title: What happened to options in rules in ANTLR 4?
body: <p>This does not compile in ANTLR 4:</p>
  
  <pre><code>Number options { backtrack=true; }
    : (IntegerLiteral Range)=&gt; IntegerLiteral { $type = IntegerLiteral; }
    | (FloatLiteral)=&gt; FloatLiteral { $type = FloatLiteral; }
    | IntegerLiteral { $type = IntegerLiteral; }
    ;
  </code></pre>
  
  <p>because of backtrace= true... What happened to it?</p>
  
  <p>WHat should I use in ANTLR 4 instread of it?</p>