Re: Arbitrary function: find the number(s) of expected arguments

[Paul Pogonyshev]

Drew Adams wrote:

> IIUC, you _cannot_ use `func-arity' to test whether something

> is a subr.

Yes, but you can and should use `subrp' for that.

> IOW, I am repeating the same argument I made before, when

> I said that `subr-arity' should not be deprecated and

> simply replaced by `func-arity'.

I understood it as argument against aliasing `subr-arity' to

the new function: this can break _existing_ code if it relies

on the fact that `subr-arity' signals an error when called with

anything, but builtin.

> This is a step backward.  Unless we are really deprecating

> and replacing it, we should document `subr-arity' properly,

> as before, with the addition of cross-ref to see `func-arity',

> stating that it handles any type of function.

I personally don't see why we need two functions for this.

So, I would deprecate `subr-arity', but keep it around for

backward compatibility.

On the other hand, I don't really care. All I want is that there

is `func-arity' that works for _any_ function. I'm not attached

to anything in the patch and as long as `func-arity' works, feel

free to change anything.

Paul