"LaTeX2e reserved" streams when using plain TeX

[blefloch]

The output of running TeX on

\input expl3-generic
\ExplSyntaxOn
\iow_list_streams:

is

The following input streams are in use:
>  0  =>  LaTeX2e reserved.

I guess we could conditionally replace that text by TeX reserved.

[josephwright]

Perhaps just Reserved by format/Format reserved or similar so we don't have to have a conditional?

[blefloch]

I like Reserved by format better than Format reserved. Looking at the code, I see that the number of reserved streams is hard-coded, and only correct for LaTeX2e. How hard would it be to get the actual number from \count17 (for writes) in a clean way?

[josephwright]

@blefloch I'm working on it: there are a few tricky bits (ConTeXt scheme different from plain different from the etex one!) but it's doable. Check-in soon.