Re: `@code` doesn't allow line break after first `-`

[Gavin Smith]

On Thu, Jan 12, 2023 at 07:34:23AM +0000, Werner LEMBERG wrote:
> 
> >> However, I've tried to fix it in commit bdb7f23072 (texinfo.tex
> >> version 2023-01-11.18).
> > 
> > It works, thanks!
> 
> Mhmm, more tests show that for `@code{foo--bar}` there is no
> `@discretionary` after the two hyphens.  Is this intentional?

Yes, it is.  This was to stop hyphenation in @option{--option}.

> Additionally, I wonder whether the same logic should be applied to
> `_`.  If you want to document, say, C prepocessor symbols, you will
> have tokens like `_foo` or `__foo_bar`, and `texinfo.tex` happily
> inserts `@discretionary` after all of those underline characters.

That would make sense.  There is a comment:

% An additional complication: the above will allow breaks after, e.g.,
% each of the four underscores in __typeof__.  This is bad.
% @allowcodebreaks provides a document-level way to turn breaking at -
% and _ on and off.

but it would make sense to do the same thing for _ as for -.