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bug#29579: 26.0.90; file-name-non-special does not handle operations wit

From: Michael Albinus
Subject: bug#29579: 26.0.90; file-name-non-special does not handle operations with two args properly
Date: Tue, 05 Dec 2017 13:48:23 +0100

# There's no /tmp/foo nor /tmp/bar
ls /tmp/foo /tmp/bar
ls: cannot access '/tmp/foo': No such file or directory
ls: cannot access '/tmp/bar': No such file or directory

# Create /tmp/foo
mkdir /tmp/foo

# Run the test
emacs -Q -batch --eval '(copy-directory "/:/tmp/foo" "/:/tmp/bar")'
Creating directory: No such file or directory, /:/tmp/bar

# Run a similar test
emacs -Q -batch --eval '(copy-directory "/:/tmp/foo" "/ssh::/tmp/bar")'
Creating directory: No such file or directory, /ssh::/tmp/bar

The problem is, that `file-name-non-special', responsible for the first
argument "/:/tmp/foo", binds `file-name-handler-alist' to nil. The second
argument is handled literally. This happens for all operations, which
offer more than one file name argument.

In GNU Emacs 26.0.90 (build 20, x86_64-pc-linux-gnu, GTK+ Version 3.22.25)
 of 2017-12-05 built on detlef
Repository revision: 1ef1dbdbc5921ec476732954cd70e8530405f208
System Description:     Ubuntu 17.10

Recent messages:
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Checking new news...done
uncompressing 23795.gz...done
Deleting article 23795 in default
uncompressing 23796.gz...done
Deleting article 23796 in default
Saving /home/albinus/.newsrc.eld...
Saving file /home/albinus/.newsrc.eld...
Wrote /home/albinus/.newsrc.eld
Saving /home/albinus/.newsrc.eld...done

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Major mode: Group

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