bug#43375: 26.1: file-directory-p returns t for empty string

[Andreas Schwab]

On Sep 13 2020, Boruch Baum wrote:

> Then the docstring could be clearer and say "Return t if the expansion
> of FILENAME names an existing directory" instead of simply the current
> "Return t if FILENAME names an existing directory". Would that be an
> acceptable change?

This is already documented in the Elisp manual:

       Many of the file functions take one or more arguments that are file
    names.  A file name is a string.  Most of these functions expand file
    name arguments using the function ‘expand-file-name’, so that ‘~’ is
    handled correctly, as are relative file names (including ‘../’ and the
    empty string).  *Note File Name Expansion::.

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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