anchor.diff:      //|   expression '.' 'new' nonWildcardTypeArguments? innerCreator
       //|   expression '.' 'super' superSuffix
       //|   expression DOT explicitGenericInvocation
  -    |     expression '.' Identifier arguments  #exprInvocation
  +    |     expression '.' (Identifier arguments)  #exprInvocation
       //|   expression LBRACK expression RBRACK
       //|   expression '(' expressionList? ')'
       //|   NEW creator
  
positive.code: methodDecl*
  ;
  methodDecl:
      Identifier Identifier  arguments '{' statList '}'
  ;
  
  statList:
  
negative.code:     |   StringLiteral 
      |   BooleanLiteral 
      |   'null' 
      ;
  
  arguments
  