bug#19634: counting MANY function args more reliably

[Paul Eggert]

On 01/22/2015 08:31 AM, Eli Zaretskii wrote:
> Do we want to use this for every call to a function that accepts MANY
> args, or just those where the argument is an array?

We should use it for calls where counting the number of arguments is 
likely to be error-prone.

> I'm asking because the proposed patch left out this part of w32fns.c:
>
>    static Lisp_Object
>    x_create_tip_frame (struct w32_display_info *dpyinfo,
>                       Lisp_Object parms, Lisp_Object text)
>    {
>      [...]
>      Ferase_buffer ();
>      Finsert (1, &text);  <<<<<<<<<<<<<<<<<<<<<<

The patch does not affect calls like that, as they're unlikely to give 
rise to the sort of typographical error that motivated the patch.