anchor.diff:   */
   keywordPropertyNames
       :   (
  -          "as"
  +          "abstract"
  +        | "as"
           | "assert"
           | "break"
           | "case"
  
positive.code:         | "public"
          | "return"
          | "static"
          | "switch"
          | "synchronized"
          | "threadsafe"
  
negative.code:         | "enum"
          | "extends"
          | "false"
          | "final"
          | "finally"
          | "for"
          | "if"
  