[antlr-interest] Mismatched Character, expecting set null

[Gerald Rosenberg]

  ------ Original Message (Friday, August 06, 2010 2:16:06 AM) From: Ken 
Klose ------
Subject: [antlr-interest] Mismatched Character, expecting set null
> fragment DIGIT: '0'..'9';
> fragment LETTER : ('a'..'z' | 'A'..'Z');

Remove the 'fragment' modifier.  They are not visible from the parser.