anchor.diff:  lexer grammar ANTLRv4Lexer;
   
   
  -options { superClass = LexerAdaptor; }
  +options { superClass = Antlr2BGF.AntlrParser.LexerAdaptor; }
   import LexBasic;
   // Standard set of fragments
   tokens { TOKEN_REF , RULE_REF , LEXER_CHAR_SET }
  
positive.code:    { handleBeginArgument(); }
     ;
     // -------------------------
     // Actions
  
  BEGIN_ACTION
     : LBrace -> pushMode (Action)
     ;
     // -------------------------
     // Keywords
  
negative.code:    : .
     ;
     // -------------------------
     // Target Language Actions
     //
     // Many language targets use {} as block delimiters and so we
     // must recursively match {} delimited blocks to balance the
  