Subject: bug#43374: 26.1: read-directory-name not respecting MUST-MATCH arg

From: Boruch Baum <[email-masked]>
Date: Sun, 13 Sep 2020 08:42:18 -0400

based upon the function's docstring, I was expecting the following to
return nil for a non-existing directory. Instead, it returns a string of
the non-existing directory.

   (read-directory-name "Directory: " nil nil t nil)

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