anchor.diff:  
   grammar Clojure;
   
  -file: form* #ftest;
  +file: list*;
   
  -form: kw
  -    | literal
  -    | let_form
  +form: literal
       | list
       | vector
       | map
  
positive.code: /* Converted to ANTLR 4 by Terence Parr. Unsure of provence. I see
     it commited by matthias.koester for clojure-eclipse project on
     Oct 5, 2009:
  
negative.code:     ;
  
  literal
      : STRING
      | NUMBER
      | CHARACTER
      | NIL
      | BOOLEAN
      | KEYWORD
      | SYMBOL
      | PARAM_NAME
      ;
  
  STRING : '"' ( ~'"' | '\\' '"' )* '"' ;
  