* Oleksandr Manzyuk (2009-04-02) writes:

> I just have noticed that Paul Taylor's package diagrams.sty confuses
> AUCTeX. A minimal example:
[...]
> Try to compile it (be sure to put the attached file diagrams.sty
> somewhere TeX can find it). This should produce an error message, but
> when you hit C-c `, you should get an empty *TeX Help* window and a
> message in the minibuffer
>
> Search failed: "^l\\."
>
> However if you press C-c C-l and check the TeX output, you'll see that
> the compilation was successful. My guess is that this happens because
> diagrams.sty echoes its error messages (which are not TeX errors but
> merely internal errors of the package itself) in lines starting with
> bang (!).

Ideally the package should issue warnings, not TeX errors.  Perhaps this
could be suggested to the author.

Nevertheless, AUCTeX should not barf on trying to display a help message
in this case.  I've checked in a change which makes the behavior more
robust.

-- 
Ralf


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