Re: Getting arity of closures

[Bill Allombert <Bill.Allombert@math.u-bordeaux.fr>]

On Mon, Feb 25, 2019 at 09:30:06PM +0000, Jacques Gélinas wrote:
> >It would seem to me that this should work:
> > ? install("closure_arity","lG")
> 
> Nice solution, but does not work for some builtins.
> 
> vc = vector;
> vc(1,k,k)
>   ***   at top-level: vc(1,k,k)
>   ***                 ^---------
>   ***   too many parameters in user-defined function call.
> closure_arity(vc) == 2

This is correct: the loop index name is not a function parameter,
so vector only has two arguments, the length and the inline closure.

Cheers,
Bill.