anchor.diff:  
   formalParameters
       : '(' (formalParameter (',' formalParameter)*)? ')'
  -    -> ^(FORMAL_PARAMETER_LIST ^(FORMAL_PARAMETER formalParameter)*)
  +    -> ^(PARAM_LIST ^(PARAM formalParameter)*)
       ;
   
   //Support for declaring functional formal parameters outside
  
positive.code:     ANNOTATION_LIST;
      ALIAS_DECL;
      ANNOTATION_NAME;
      ARG_NAME;
      ATTRIBUTE_ARG;
      ATTRIBUTE_DECL;
      ATTRIBUTE_GETTER;
  
negative.code:     FOR_CONTAINMENT;
      FOR_ITERATOR;
      FOR_STMT;
      PARAM_NAME;
      PARAM;
      PARAM_LIST;
      IF_FALSE;
      IF_STMT;
      IF_TRUE;
  