anchor.diff:  //be careful with this one, since it 
   //matches "()", which can also be an 
   //argument list
  -formalParametersStart
  +parametersStart
       : '(' ( annotatedDeclarationStart | ')' )
       ;
       
  
positive.code: methodParameters
      : 
          typeParameters? 
          formalParameters+ 
          extraFormalParameters? 
          metatypes? 
          typeConstraints?
      ;
  
negative.code:     ;
  
  functionalArgumentParameters
      : (parametersStart) => parameters
      | -> ^(PARAMETER_LIST)
      ;
  
  