Philipp Stephani <p.stephani2@gmail.com> schrieb am Di., 19. Sep. 2017 um 10:31 Uhr:

Glenn Morris <rgm@gnu.org> schrieb am Di., 19. Sep. 2017 um 02:41 Uhr:

> I do agree that the calling convention of `file-name-base' is odd. How
> about making the argument mandatory (initially only by changing the
> advertised calling convention and the docstring)?

Sounds good to me.

OK, here's a patch. 

New version of the patch, with all callers and the manual fixed.