bug#26486: 25.1.91; unused var warning from cconv.el can't be suppressed

[Lars Ingebrigtsen <larsi@gnus.org>]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> LGTM, thank you.

Thanks; applied.

> This said, I suspect that it may fail to correctly
> heed `with-suppressed-warnings`.  More specifically, I think we may want
> to add a "category" argument to `macroexp-warn-and-return` which is then
> matched against `byte-compile-warnings` (either directly inside
> `macroexp-warn-and-return` or within the subsequent handling of
> `macroexp--funcall-if-compiled`).

Right.  Could you fix that?  :-)

> We already discussed the use(ful|less)ness of this empty-body warning,
> and I don't think it's useful enough to justify adding a new warning
> category for it.
>
> When `byte-compile-warnings` is nil, arguably `macroexp-warn-and-return`
> should just silence all warnings.

Right...  but it feels kinda hackish to add the check for just
`byte-compile-warnings' there, since we don't have access to the
category at that point, so I altered the call site instead.  But perhaps
`macroexp-warn-and-return` should just be extended with a category
parameter and then the check moved into the function instead...  I dunno...

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