"Transaction is out of date" on svn cp to nonexistent URI

I was creating a tag-of-sorts with svn cp and forgot to do a svn mkdir
first, and ran into this problem (simplified for this example):

% svn mkdir file:///var/svn/repos/test/a -m "a"

Committed revision 1.
% svn cp file:///var/svn/repos/test/a file:///var/svn/repos/test/b/c -m "b"

svn_error: #21084 : <Transaction is out of date>
  out of date: `b' in txn `2'

Shouldn't svn say something like 'b does not exist' instead?

-- 
=Nicholas Riley <njriley_at_uiuc.edu> | <http://www.uiuc.edu/ph/www/njriley>
        Pablo Research Group, Department of Computer Science and
  Medical Scholars Program, University of Illinois at Urbana-Champaign
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