bug#66912: With `require', the byte compiler reports the wrong file for errors.

[Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

>> +DEFUN ("prefix-load-file-names", Fprefix_load_file_names,
>> +       Sprefix_load_file_names, 1, 1, 0,
>> +       doc: /* Prefix the string BASE_STRING with a message about each
>> +file currently being loaded.  Return the resulting string and reset this
>> +information to null.  */)
>
> What "this information"?

Oh, also, I missed it but: "file currently being loaded" is not right
(by the time we use this function, we're usually not loading the file
any more, because of the error: we already unwound the stack and exited
the `load`s).

> Btw, why isn't this function marked as internal by double-dash?
> Or did you want to document it?

Given its odd calling convention (it strongly depends on timing and on
the current implementation strategy), I'd recommend a double dash
because if we ever care to fix its shortcomings we'd have to change it
in an incompatible way.


        Stefan