Le 03/06/2021 à 07:55, Ikumi Keita a écrit :
Sorry for late, I have now applied the patch and it seems
to do exactly what I was expecting.
Thanks for confirmation. The proposed patch has a small incompatibility
with the current AUCTeX that the customize option
`TeX-error-description-list' can no longer have a fallback entry that
matches any error, but I expect that there are few users who customized
it. I included a news entry which warns the incompatibility in the
attached patch.

Does anyone have comments or opinions?

Hi, only to confirm patch applied cleanly.
I tested it with LaTeX and with Plain (with pdftex engine) and it appears
to work as expected, at my locale.  I don't have experience with
customizing TeX-error-description-list so can't comment on the fallback
entry un-customizability.  Here is a situation
causing pdftex to abort abruptly after an initial error, and
then "No help available" is shown.
----
ABCD

\def\foo{\begingroup\foo}

\foo

\bye
----
(the "No help available" context will appear if producing PDF not DVI
as it is triggered by an error

==> Fatal error occurred, no output PDF file produced!

generated by pdftex only in pdf mode)


Best,
Jean-François





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