Re: Function value changes after running function?

[Stefan Monnier <monnier@iro.umontreal.ca>]

> No, I wrote a macro like `cl-loop` here:
>
> https://github.com/okamsn/loopy
>
> I received a bug report that said that the above function would raise an 
> error after running a second time here:

In the current situation, the problem is:

    (setq loopy--main-body (nreverse loopy--main-body)
          loopy--with-vars (nreverse loopy--with-vars))

which reverses the "with vars" received as arguments.
If you replace `nreverse` with `reverse` here, this particular problem
should disappear.

This said, this `nreverse` reverses the order of the bindings in (with ....)
which maybe isn't what you intended (I suspect that the `nreverse` here
is meant to reverse the bindings added to `loopy--with-vars` via
`push`).
So maybe a better solution is to replace

        (setq loopy--with-vars (cdr arg)))

with

        (setq loopy--with-vars (reverse (cdr arg))))

so that the subsequent `nreverse` puts them back in the original order.


        Stefan