bug#47762: Doc of `macroexp-file-name' (Emacs 28)

[Eli Zaretskii]

> From: Drew Adams <drew.adams@oracle.com>
> Date: Tue, 13 Apr 2021 22:34:57 +0000
> 
> The doc string shown there is this:
> 
>  Return the name of the file from which the code comes.
>  Returns nil when we do not know.
>  A non-nil result is expected to be reliable when called from a macro in order
>  to find the file in which the macro's call was found, and it should be
>  reliable as well when used at the top-level of a file.
>  Other uses risk returning non-nil value that point to the wrong file.
> 
> Please consider clarifying the doc for this function.  For example, just
> what code is meant here: "the file from which the code comes"?
>                                               ^^^^^^^^

This is explained by the text that you cited.

Closing.