[metapost] Finding line containg error in Metapost file

[Peter Zeman]

Hello.

I would like to ask whether it is "algorithmically" possible to find
the line with error in a metapost file just with the information given
by "mpost". I mean, is the line with error uniquely determined by the
output of "mpost"?

I would like to write a program, which tells me the line containing
error. I know, that metapost gives me a line, but I would like to know
the exact line. For example if I have a macro with an error, I don't
want the line where the macro was used, but the line in the macro,
which contains the error. Is this possible?

Thank you for your answers.

Peter Zeman