bug#34776: Acknowledgement (27.0.50; Some questions about choose-completion-string-functions)

[Glenn Morris]

Eric Abrahamsen wrote:

> Actually it looks like I was wrong about using add-function with
> choose-completion-string-functions, it's just a plain list you stick
> functions into. I think it has to be an error not to declare it
> buffer-local... I've worked around this with `make-local-variable', but
> I'm halfway sure this should be a defvar-local...?

The two uses in the Emacs code-base use add-hook without LOCAL.
completing-read-multiple and ido-common-initialization.