Re: Should nil COLLECTION element mean a "nil" candidateforcompleting-read? Alist doc.

[Stefan Monnier]

>> It's not a feature.
> Right; it's a bug - a regression wrt Emacs 21, in fact (you admit it wasn't

No.  It's a change in undocumented and unsupported use-case.
We sometimes try to preserve bug-compatibility, but not always.

> I pose the questions: Should nil be ignored here? Should nil be
> treated like the string "nil" here?

If we wanted to give it a defined behavior, I'd vote for "signal an
error".  But until proven otherwise, I think it's not worth the trouble.


        Stefan