anchor.diff:   */
   methodDeclaration[int t, int ct]
       :   { 3 == $ct }?
  -        returnType[$ct] methodName LPAREN rparen (DEFAULT nls elementValue)?
  +        returnType[$ct] methodName LPAREN RPAREN (DEFAULT nls elementValue)?
       |
           (   { 0 == $t }?
               modifiersOpt typeParameters?
  
positive.code:     ;
  
  formalParameters
      :   LPAREN formalParameterList? rparen
      ;
  
  formalParameterList
  
negative.code:     ;
  
  typeNamePairs
      :   LPAREN typeNamePair (COMMA typeNamePair)* RPAREN
      ;
  
  typeNamePair
  