[antlr-interest] ANTLR does not properly recognise single characters?

[Mark]

I'm having some rather strange behaviour from ANTLR when presenting it with
single character tokens.  I have the following declared:

L	:	(('A'..'Z')|('a'..'z')|'_');
N	:	('0'..'9');
IDENTIFIER  :	L ((L|N)*);

But when I run my parser I've seen the following error:
> line 3:10 mismatched input 't' expecting IDENTIFIER

This seems to make no sense, as "t" should match IDENTIFIER.  Changing the
identifier 't' in the source language to 'tu' fixes the problem, so the
problem is specific to matching single character tokens.  Can anyone shed
any light on what's going on here?

Thanks,
Mark


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