Le 28/07/2023 à 16:28, LARONDE Thierry a écrit :
>[...]
> 
> Yes. But the same engine does things differently between LaTeX
> 2022-11-01 and LaTeX 2023-06-01.
> 
> So could someone give me the diff of the input related things in
> LaTeX between these two versions so that I can have a clue about
> what LaTeX is expecting and what it is eventually calling (because it
> could be calling, low level, the open routine, and there is no
> acrobatics made in the open routine in kerTeX: the handling is made
> before calling the routine; so if LaTeX is calling low level like
> this, the result is not a surprise).

I prefere meld :-)

TeXLive2019:
------------
\def\input{\@ifnextchar\bgroup\@iinput\@@input}
\def\@iinput#1{%
   \InputIfFileExists{#1}{}%
   {\filename@parse\@curr@file
    \edef\reserved@a{\noexpand\@missingfileerror
      {\filename@area\filename@base}%
      {\ifx\filename@ext\relax tex\else\filename@ext\fi}}%
    \reserved@a}}

TeXLive2022:
------------
\def\input{\@ifnextchar\bgroup\@iinput\@@input}
\def\@iinput#1{%
   \InputIfFileExists{#1}{}%
   {\filename@parse\@curr@file
    \edef\reserved@a{\noexpand\@missingfileerror
      {\filename@area\filename@base}%
      {\ifx\filename@ext\relax tex\else\filename@ext\fi}}%
    \reserved@a
    \edef\reserved@a{\noexpand\@iinput{%
      \@missingfile@area\@[log in to unmask]\@missingfile@ext}}%
    \reserved@a}}


I didn't see any other difference.

   Jean-Côme Charpentier