bug#40968: 28.0.50; (apply nil)

[Drew Adams]

> > And if Elisp follows that (which I think it should,
> > unless someone can present a good use case for just
> > (apply FUNCTION)), then it should raise an error if
> > there are not at least two args.
> 
> Note that single-argument apply in current Elisp is not (apply
> FUNCTION) but (apply LIST-OF-FUNCTION-PLUS-ARGS).
> 
> (apply '+) is an error.
> (apply '(+)) is 0.
> 
> That's why the problem with (apply nil) arose.

I think (apply '(+)) should raise an error, because
(a) the first arg is not a function and (b) it's
missing a second arg.

I think (apply ()) should raise an error for the
same reason: nil is not a function, and there's no
second arg.