error-tokens and locations?

[Ian Badcoe]

Hi, sorry if you see multiple copies but the first disappeared without trace,

        I think this may be a bug, but I'm not 100%, so I thought I'd ask here 
first.

	I have a grammar with some error productions, and in the actions I try to 
pass the location of the error token into a support routine so that I can 
give nice error messages.

	Mostly this works, but for one or two of the productions I get silly 
locations.

	Investigating a bit further, I redefined YYLLOC_DEFAULT so that it could 
print me some diagnostics and it's sometimes getting called with num == 
0.  I'm fairly sure the default definition cannot handle that either.

	So, my question is should I be able to use the locations of error 
tokens?  I haven't seen anything which suggests not, in fact I'd think it 
the most common use for them.

	If it should work, then it may be a bug.  I can post a smallish 
demonstration here if anybody needs it, or I could go straight over to the 
bugs list.

        Thanks,
                Ian B
Free transport into the future, while you wait.