Subject: Re: bug#30106: Loading file /sources/emacs/lisp/emacs-lisp/ert.elc failed to provide feature `mod-test'

From: Glenn Morris <[email-masked]>
Date: Mon, 15 Jan 2018 12:56:17 -0500

Eli Zaretskii wrote:

>   src/emacs-module-tests.el:32:1:Error: Loading file /sources/emacs/lisp/emacs-lisp/ert.elc failed to provide feature `mod-test'
>
> line 32 of emacs-module-test.el is this:
>
>   (require 'mod-test mod-test-file)
>
> So one problem could be that mod-test-file is somehow not calculated
> correctly:
>
>   (eval-and-compile
>     (defconst mod-test-file
>       (substitute-in-file-name
>        "$EMACS_TEST_DIRECTORY/data/emacs-module/mod-test")
>       "File name of the module test file."))
>
> So maybe EMACS_TEST_DIRECTORY is incorrect, you your Emacs tree
> doesn't have the test/data/emacs-module/mod-test directory, or there's
> no mod-test.so file in that directory?

But that would give a different error message.

It seems that Fmodule_load does not update load-history.
This is causing Frequire to report the wrong file names in its error
message, which is making it hard to diagnose the real problem.