Subject: 25.0.50; Documentation of file-name-sans-extension seems wrong

From: Thomas Emile Bourgeat <[email-masked]>
Date: Sat, 28 May 2016 22:04:40 -0400

(file-name-sans-extension "foo.bar") produces "foo" when the
documentation suggests it should produce "foo.":

> Return FILENAME sans final "extension".
> The extension, in a file name, is the part that follows the last ‘.’,
> except that a leading ‘.’, if any, doesn’t count.

In GNU Emacs 25.0.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.25)
 of 2015-10-30
Repository revision: 9c36df736b89490d14a5b5109c9c00209a0c25f5
Windowing system distributor 'The X.Org Foundation', version 11.0.11604000
System Description:	Debian GNU/Linux 8.4 (jessie)

Configured features:
XPM JPEG TIFF GIF PNG SOUND GSETTINGS NOTIFY LIBXML2 FREETYPE XFT ZLIB
TOOLKIT_SCROLL_BARS GTK2 X11