anchor.diff:      if (catchKeyword != null) {
         exitLocalScope();
       }
  -    TypeName type = popIfNotNull(onKeyword);
  +    TypeAnnotation type = popIfNotNull(onKeyword);
       SimpleIdentifier exception;
       SimpleIdentifier stackTrace;
       if (catchParameters != null) {
  
positive.code:     FormalParameterList formalParameters = pop();
      TypeParameterList typeParameters = pop();
      SimpleIdentifier name = pop();
      TypeName returnType = pop();
  
      {
        _Modifiers modifiers = pop();
  
negative.code: 
    void handleIsOperator(Token operator, Token not, Token endToken) {
      debugEvent("IsOperator");
      TypeAnnotation type = pop();
      Expression expression = pop();
      push(ast.isExpression(
          expression, toAnalyzerToken(operator), toAnalyzerToken(not), type));
  