Re: problem with (display . [not expire]) with git emacs

[Eric Abrahamsen <eric@ericabrahamsen.net>]

Dan Christensen <jdc@uwo.ca> writes:

> Two additional things.  First, I should have said that Gnus does not
> raise an error.  It just silently ignores my [not expire] setting.
>
> Second, here is a link to the relevant commit, which shows the diff:
>
> https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=8525be6d5eca0c75008ec1dc799cae537156feea
>
> Is anyone else using git emacs since Nov 29 and also using (display
> . [not expire])?

I just tried it out, and actually got a popup buffer with the "Malformed
function" error you mentioned in your first message.

Looks like the culprit is effectively this:

(gnus-byte-compile
  `(lambda ()
    ,(cdr (assoc 'expire gnus-summary-display-cache))))

That's pretty much what `gnus-category-make-function' is doing, given
that at that point `gnus-category-predicate-alist' has been let-bound to
the value of `gnus-summary-display-cache'. I don't see where that
variable gets all its values, but one of its elements is:

(expire . #f(compiled-function () #<bytecode 0xc27be483>))

And apparently that's what is barfing when it gets byte compiled.
Weirdly, after fooling around with it a bit, the bytecode there must
have gotten "fixed" somehow, and the display parameter stopped giving me
an error (and started working correctly). Dunno what's happening there.

Eric