bug#29866: 27.0.50; cl-loop: Calculate the array length just once

[Noam Postavsky]

tags 29866 - patch
tags 29866 + wontfix
quit

Tino Calancha <tino.calancha@gmail.com> writes:

>               (let ((temp-vec (make-symbol "--cl-vec--"))
> +                      (temp-len (make-symbol "--cl-len--"))
>                     (temp-idx (make-symbol "--cl-idx--")))
>                 (push (list temp-vec (pop cl--loop-args)) loop-for-bindings)
> +               (push (list temp-len `(length ,temp-vec)) loop-for-bindings)
>                 (push (list temp-idx -1) loop-for-bindings)

I reverted this because it breaks with 'and' because the bindings are
made with 'let' rather than 'let*' (see Bug#40727).  I'm marking wontfix
because I don't intend to anything more about it, but I wouldn't oppose
another attempt that didn't have this problem (I think it would require
extensive code changes though).