Hacked my way around not being able to have obj.default() as a method call.. probably would need to add more scope around this however

gistfile1.txt

--- lexer.l.orig	2011-10-07 14:48:04.000000000 +0000
+++ lexer.l	2011-10-07 14:53:36.000000000 +0000
@@ -23,7 +23,7 @@
 <INITIAL>"finally"	return 'FINALLY';
 <INITIAL>"case"		return 'CASE';
 <INITIAL>"switch"	return 'SWITCH';
-<INITIAL>"default"	return 'DEFAULT';
+<INITIAL>[^\.]"default" { return 'DEFAULT'; }
 <INITIAL>"this"         return 'THIS';
 <INITIAL>"with"         return 'WITH';
 <INITIAL>"#!"[ ]*[/].*  return 'SHBANG';