[antlr-interest] Manually raising recognition error

[Mike Lischke]

Hi list,

similar questions have been asked already, but I couldn't find any answer (neither in MarkMail nor Google). Given a rule like this:

a:
	b (c | d)
;

I would like to report more precisely if both c and d are missing. Letting the default handling process this I often get errors that don't really address the actual problem. So I tried:

a:
	b
	(
		c
		| d
		| -> ^(MISSING_TOKEN)
	)
;

which works very well, except that now I don't get any error at all and would need to parse the tree to know that there was a missing token. So my wish is to also raise an error in addition.

I guess raising an error is specific to the parser target, so I'd be especially interested in a C target solution.

Mike
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