Python syntax warning in the regression tests

I think I understand the warning, but I'm not sure how best to fix it.

$ cd subversion/tests/clients/cmdline
$ ./copy-tests.py list > /dev/null
./copy_tests.py:1191: SyntaxWarning: local name 'wc_dir' in 'revision_kinds_local_source' shadows use of 'wc_dir' as global in nested scope 'cp_test'
  def revision_kinds_local_source(sbox):
./copy_tests.py:1191: SyntaxWarning: local name 'mu_path' in 'revision_kinds_local_source' shadows use of 'mu_path' as global in nested scope 'cp_test'
  def revision_kinds_local_source(sbox):
./copy_tests.py:1191: SyntaxWarning: local name 'expected_disk' in 'revision_kinds_local_source' shadows use of 'expected_disk' as global in nested scope 'cp_test'
  def revision_kinds_local_source(sbox):

-- 
Philip Martin
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