Re: Usefulness of (t nil) as the last sexp in (cond ...) constructs?

[Jeremiah Dodds]

Bastien <address@hidden> writes:

> There are many places in *.el elisp files where we have this construct
>
> (cond (...)
>       (...)
>       (t nil))
>
> My understanding is that (t nil) is useless, since the ̀t' condition 
> is only tested if other conditions are `nil'.
>
> What is the purpose of (t nil)?

IIRC, it's mostly there to make it explicit that "this cond is expected
to return nil sometimes".

> Can we safely remove it?

Again, IIRC, it shouldn't affect behaviour to do so, but it might not be
preferable. 

-- 
Jeremiah Dodds

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