Re: master 4bc9fe33af: Rename 'elisp-eval-buffer' to 'elisp-eval-region-or-buffer' (bug#59350)

[Stefan Monnier]

>>>     * lisp/progmodes/elisp-mode.el (elisp-eval-region-or-buffer):
>>>     Rename recently added command 'elisp-eval-buffer' to support active 
>>> region.
>>>     (emacs-lisp-mode-map, lisp-interaction-mode-map): Rebind 'C-c C-e'
>>>     from elisp-eval-buffer to elisp-eval-region-or-buffer.
>>
>> Could we make it do the `eval-sexp-add-defvars` dance when evaluating a 
>> region?
>
> Not sure how to do this on the region that might contain several expressions.
> Currently it's used only on a single expression in elisp--eval-last-sexp
> and elisp--eval-defun.

I think the way to do that is to let `eval_region` take an initial
environment as argument (just like `eval`), and then populate this env
based on the `defvar`s found before the region.


        Stefan