get col, row (as Int's) and error message of the first TrivialError

[KeesBleijenberg]

The tutorial is not clear to me. It is about displaying error messages, not getting the value of the col and row. I can get the offset of an error. But how do I calculate the col and row from the offset?

[mrkkrp]

I think you are looking for attachSourcePos. You can run your parser with runParser' to get PosState s (it will be inside State s e).

[KeesBleijenberg]

Thank you. This solved the problem.