Miles Bader <miles@lsi.nec.co.jp> writes:
> There's no need to add a new field to `struct buffer' for the
> `abbrev-case-fold' variable, you can just declare a normal variable
> Vabbrev_case_fold using DEFVAR_LISP, and emacs will do the right thing
> if a mode makes it buffer-local.  [There are obviously trade-offs, but I
> think for something minor like this you shouldn't extend the buffer
> structure]

You are right, and I was hoping for a solution that was simpler than
that. :-)

> The feature that makes it track `case-fold-search' probably isn't useful
> -- I expect that in most cases people will want to retain
> case-insensitive searching, even in situations where case-sensitive
> abbrevs would be appropriate.  I think you should just initialize the
> global value to `nil' for compatibility, and leave it to individual
> language modes to set a different buffer-local value.

All right.  Here is a much cleaner patch: