Index: Lib/test/regrtest.py
===================================================================
--- Lib/test/regrtest.py	(revision 75216)
+++ Lib/test/regrtest.py	(working copy)
@@ -622,16 +622,12 @@
     if use_resources is not None:
         test_support.use_resources = use_resources
     try:
-        return runtest_inner(test, verbose, quiet,
-                             testdir, huntrleaks)
+        return runtest_inner(test, verbose, quiet, huntrleaks)
     finally:
         cleanup_test_droppings(test, verbose)
 
-def runtest_inner(test, verbose, quiet,
-                  testdir=None, huntrleaks=False):
+def runtest_inner(test, verbose, quiet, huntrleaks=False):
     test_support.unload(test)
-    if not testdir:
-        testdir = findtestdir()
     if verbose:
         capture_stdout = None
     else: