anchor.diff:      ;
   
   valueFormalParameter
  -    : '->' union parameterName
  +    : '->' type parameterName
       ;
   
   iteratedFormalParameter
  -    : 'in' union parameterName
  +    : 'in' type parameterName
       ;
   
   specifiedFormalParameter
  -    : '=' union parameterName
  +    : '=' type parameterName
       ;
   
   specifiedFormalParameterStart
  
positive.code:     ;
  
  declarationStart
      : declarationKeyword | union '...'? LIDENTIFIER
      ;
  
  declarationKeyword
  
negative.code:     ;
  
  memberType
      : type | 'void' | 'local'
      ;
  
  memberParameters
  