Error handling with Coco/r

I'm using the tool Coco/r to build a grammar for a programming language. My
token section is something like this:


id = letter { letter | digit }.
integer = digit { digit }
                          | digit { hexDigit } "H".


The problem is that a wrong hexadecimal number in an assignment such as "a :=
32GH;" is identified as an error by the syntax analyzer. I would like to
produce a more meaningful message such as "invalid hexadecimal" so I think I
need to detect errors at lexer level. Is there any option in Coco/r or should
I have to modify the scanner by hand?


Thanks,

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