bug#71934: comp--spill-lap-function and closure (wad: bug#71934: 31.0.50; edebug--called-interactively-skip vs. new fun objects)

[Andrea Corallo <acorallo@gnu.org>]

Alan Mackenzie <acm@muc.de> writes:

> Hello, Stefan.
>
> On Fri, Jul 05, 2024 at 14:17:38 -0400, Stefan Monnier wrote:
>> > Not sure what you mean by "no such thing as a form ... like a closure".
>
>> A form that starts with `closure` is not a valid form because there is
>> no definition for `closure`: (fboundp 'closure) => nil.
>
>> > I bumped into one last summer.
>
>> > In particular (in my development repo fixing bug #64646) I put this into
>> > *scratch*:
>
>> >     (defconst foo (lambda (baz) (car baz)))
>
>> > , evaluated it with C-x C-e and then M-: (native-compile foo).  This
>> > threw the error "Cannot native-compile, form is not a lambda".
>
>> That error seems right according to the docstring:
>
>>    (defun native-compile (function-or-file &optional output)
>>      "Compile FUNCTION-OR-FILE into native code.
>>    This is the synchronous entry-point for the Emacs Lisp native
>>    compiler.  FUNCTION-OR-FILE is a function symbol, a form, or the
>>    filename of an Emacs Lisp source file.  If OUTPUT is non-nil, use
>>    it as the filename for the compiled object.  If FUNCTION-OR-FILE
>>    is a filename, if the compilation was successful return the
>>    filename of the compiled object.  If FUNCTION-OR-FILE is a
>>    function symbol or a form, if the compilation was successful
>>    return the compiled function."
>
>> (closure ...) is not a function symbol nor a valid form.  Instead it's
>> a function value and the docstring doesn't say such are
>> a valid arguments to `native-compile`.
>
> All very clever arguments, no doubt, but in the end it means you cannot
> native compile foo.  I've just tried it on emacs-30, and it doesn't work.
> But you could compile foo last summer after my fixes for bug #64646.
> Between last summer and now, something has gone badly wrong in Emacs's
> basic mechanisms.

(defconst foo (lambda (baz) (car baz)))                                                                                                                                           
(native-compile #'foo)

Never worked AFAIR, the functionality you added was:

(defun foo () "foo doc string"
       (lambda () "lambda doc string" 3))

(subr-native-elisp-p (funcall (native-compile 'foo)))

And this still works for me.

I'm probably missing something sorry.

  Andrea