anchor.diff:      ;
   
   importDecl
  -    : 'import' ( importSpec | '(' ( importSpec ';'? )* ')' )
  +    : 'import' ( importSpec | '(' ( importSpec eos )* ')' )
       ;
   
   importSpec
  
positive.code: 
  //StatementList = { Statement ";" } .
  statementList
      : ( statement eos? )*  // TODO EOS optional?
      ;
  
  statement
  
negative.code: //MethodName         = identifier .
  //InterfaceTypeName  = TypeName .
  interfaceType
      : 'interface' '{' ( methodSpec eos )* '}'
      ;
  
  //SliceType = "[" "]" ElementType .
  