svn 1.6.x regression: svn commit damages 'root of drive working copies' under windows

Hi.

I found a regression of Subversion 1.6.x under MS Windows.
'svn commit' damages working copy if root of working copy is a root of
drive (e.g. Z:\)

OS: MS Windows XP Pro eng sp3 or Vista Home Premium rus sp1
Subversion: svn, version 1.6.1 (r37116) compiled Apr 10 2009, 19:06:38
 from http://subversion.tigris.org/files/documents/15/45600/svn-win32-1.6.1.zip

Steps for reproduce:

C:\drive-wc-test>svnadmin create c:\testrepo

C:\drive-wc-test>mkdir wc

C:\drive-wc-test>subst z: wc

C:\drive-wc-test>pushd z:\

z:\>svn checkout file:///c:/testrepo .
Checked out revision 0.

z:\>echo file 1>file

z:\>svn add file
A file

z:\>svn commit . -m "msg"
Adding z://file
Transmitting file data .svn: Commit succeeded, but other errors follow:
svn: Error bumping revisions post-commit (details follow):
svn: In directory 'z:'
svn: Log entry missing 'name' attribute (entry 'rm' for directory 'z:')

z:\>svn up
svn: Working copy '.' locked
svn: run 'svn cleanup' to remove locks (type 'svn help cleanup' for details)

z:\>svn cleanup
svn: In directory '.'
svn: Log entry missing 'name' attribute (entry 'rm' for directory '.')

z:\>popd

If repository access is 'svn://' result is the same.
I run svn 1.6.0 - works incorrect.

With svn 1.5.6 commit works correct.

--
Andrey
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