In the following sequence wc/zog and revision 1 are created to avoid the problem
updating to rev 0 (see issue #589)
$ svnadmin create /tmp/repo
$ svn co file:///tmp/repo -d wc
$ echo zog > wc/zog
$ svn add wc/zog
A wc/zog
$ svn ci wc
Adding wc/zog
Commit succeeded.
$ svn up wc
$ svn mkdir wc/foo
A wc/foo
$ echo bar > wc/foo/bar
$ svn add wc/foo/bar
A wc/foo/bar
$ svn ci wc
Adding wc/foo
Adding wc/foo/bar
Commit succeeded.
$ svn up -r1 wc
D wc/foo
$ svn st -u wc
svn_error: #21020 : <Obstructed update>
svn_wc_entry: wc/foo/bar is not a working copy directory
Major SVN-595 recipe to make 'svn st -u' fail
