* files.el (file-name-non-special): Wrap the call of

`insert-file-contents' by `unwind-protect', in order to set the
buffer's file name anyway.

Fixes: debbugs:18891

lisp/ChangeLog

+2014-11-07  Michael Albinus  <michael.albinus@gmx.de>
+
+	* files.el (file-name-non-special): Wrap the call of
+	`insert-file-contents' by `unwind-protect', in order to set the
+	buffer's file name anyway.  (Bug#18891)
+
 2014-11-07  Daiki Ueno  <ueno@gnu.org>
 
 	* epg.el (epg--list-keys-1): Ignore fields after the 15th field

lisp/files.el

@@ -6664,7 +6664,7 @@ only these files will be asked to be saved."
       (`add (concat "/:" (apply operation arguments)))
       (`insert-file-contents
        (let ((visit (nth 1 arguments)))
-         (prog1
+         (unwind-protect
              (apply operation arguments)
            (when (and visit buffer-file-name)
              (setq buffer-file-name (concat "/:" buffer-file-name))))))