test_pyclbr.py somehow takes very long in debug mode

from_cpython/Lib/test/test_pyclbr.py

+# skip-if: True
+# - This test passes but takes an extremely long time in debug mode
+
 '''
    Test cases for pyclbr.py
    Nick Mathewson

test/CPYTHON_TEST_NOTES.md

@@ -175,6 +175,7 @@ test_pprint             [unknown]
 test_print              [unknown]
 test_profile            [unknown]
 test_py3kwarn           [unknown]
+test_pyclbr             This test passes but takes a very long time in debug mode (60s vs 5s for release mode).
 test_py_compile         [unknown]
 test_pydoc              [unknown]
 test_random             long("invalid number")