bug#26127: 26.0.50; Using file-notify-rm-watch on invalid descriptor raises invalid-function

[Andreas Politz]

Calling file-notify-rm-watch on an invalid descriptor may throw a
invalid-function error, but it should throw a file-notify-error instead.

For example, this may occur when calling the function multiple times on
the same descriptor.

The error stems from file-notify--rm-descriptor, which contains the expression

      (funcall
       (cdr (assoc file (cdr registered)))
       `(,descriptor stopped ,(if file (expand-file-name file dir)
       dir)))

, but (assoc file (cdr registered)) is nil.  I think this error is
confusing.

Attached you'll find a test case for this.

-ap

file-notify-bug-2.el
Description: test-case

In GNU Emacs 26.0.50 (build 1, x86_64-unknown-linux-gnu, GTK+ Version 3.22.9)
 of 2017-03-15 built on luca
Repository revision: 2f972349bdc99d5d9ebf63169c00e24b119aa38d
Windowing system distributor 'The X.Org Foundation', version 11.0.11902000
System Description:     Arch Linux

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x-win term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow isearch timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame cl-generic cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932
hebrew greek romanian slovak czech european ethiopic indian cyrillic
chinese composite charscript case-table epa-hook jka-cmpr-hook help
simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs button
faces cus-face macroexp files text-properties overlay sha1 md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote dbusbind inotify dynamic-setting system-font-setting
font-render-setting xwidget-internal move-toolbar gtk x-toolkit x
multi-tty make-network-process emacs)

Memory information:
((conses 16 1140844 1230822)
 (symbols 48 72307 2)
 (miscs 40 1273 8727)
 (strings 32 199591 370964)
 (string-bytes 1 7784266)
 (vectors 16 94511)
 (vector-slots 8 2252361 388185)
 (floats 8 591 1309)
 (intervals 56 63703 5137)
 (buffers 968 345))