anchor.diff:    }
   
     Token parseTopLevelMember(Token token) {
  +    // TODO(brianwilkerson) Accept the last consumed token.
  +    // TODO(brianwilkerson) Return the last consumed token.
       Token start = token;
       listener.beginTopLevelMember(token);
   
  
positive.code:   /// ;
    /// ```
    Token parseLabeledStatement(Token token) {
      // TODO(brianwilkerson): Enable this assert.
      // `parseType` is allowing `void` to be a label.
  //    assert(token.isIdentifier);
  
negative.code:   /// ;
    /// ```
    Token parseNewExpression(Token token) {
      // TODO(brianwilkerson) Accept the last consumed token.
      // TODO(brianwilkerson) Return the last consumed token.
      assert(optional('new', token));
      Token newKeyword = token;
      listener.beginNewExpression(newKeyword);
  