bug#48264: [PATCH v3 15/15] Add and use BVAR_FIELD macros

[Lars Ingebrigtsen <larsi@gnus.org>]

Eli Zaretskii <eliz@gnu.org> writes:

>> If you think such a conditionally-compiled runtime check would be
>> acceptable for applying these changes, I can go ahead and write that.
>
> Yes, I think so.  But if Lars or Stefan think differently, I might
> reconsider.

I'd prefer compile time checks, certainly...  but I see that Spencer has
added a way to get those without adding the awkward struct accessor
macros now, so I guess the question is moot.

But listing the permanently local variables in a list like this:

+/* This structure is used purely as a list of field names that are
+   permitted for use with BVAR; it's never actually instantiated.  */
+struct bvar_permanent_locals {

at least requires commentary in the struct they're defined in so that we
don't remember to update the list when we add new permanently local
variables...

-- 
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   bloggy blog: http://lars.ingebrigtsen.no