How to improve the error handling of my scanner?

I finally built my scanner and parser using Coco/R, but I need some help to
improve error handling.


For example, I tried to parse the following program:


      MODULE Program;
              VAR 4fgnn : INTEGER;
      END Program.


There's obviously an error with "4fgnn", it is a bad identifier because it
starts by a number. This is the compiler output:


      line 2 col 12: "END" expected


Of course it detects the error, but it is kind of vague.


I thought of adding a PRAGMA section to my ATG Grammar that tells Coco/R if a
string matches a bad identifier pattern, the compiler prints "Bad identifier"
using the console.


Are there better ways to achieve this?


Thanks,

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