anchor.diff:  }
   
   sourceFile
  -    : packageClause eos (importDecl eos)* (topLevelDecl eos)*
  +//    : packageClause eos (importDecl eos)* (topLevelDecl eos)*
  +    : packageClause eos (importDecl eos)* ((functionDecl | methodDecl | declaration) eos)*
       ;
   
   packageClause
  
positive.code:     ;
  
  methodExpr
      : receiverType '.' IDENTIFIER
      ;
  
  receiverType
      : typeName
      | '(' ('*' typeName | receiverType) ')'
      ;
  
  eos
  
negative.code:     ;
  
  parameters
      : '(' parameterDecl (',' parameterDecl)* ')' //'(' (parameterList ','?)? ')'
      ;
  
  /*
  parameterList
      : parameterDecl (',' parameterDecl)*
      ;
  */
  
  parameterDecl
      : identifierList? '...'? type
  