debug_script(): I changed this in haste before to take out the use of

NamedTemporaryFile (which can't work for this function's purposes on
Windows).  Leaving temp files behind wasn't a great idea either, though,
so try to clean up.  At least the test suite no longer leaves any of
these guys behind now.

Lib/doctest.py

@@ -2342,11 +2342,15 @@ def debug_script(src, pm=False, globs=None):
     "Debug a test script.  `src` is the script, as a string."
     import pdb
 
-    srcfilename = tempfile.mktemp("doctestdebug.py")
+    # Note that tempfile.NameTemporaryFile() cannot be used.  As the
+    # docs say, a file so created cannot be opened by name a second time
+    # on modern Windows boxes, and execfile() needs to open it.
+    srcfilename = tempfile.mktemp(".py", "doctestdebug")
     f = open(srcfilename, 'w')
     f.write(src)
     f.close()
 
+    try:
         if globs:
             globs = globs.copy()
         else:
@@ -2363,6 +2367,9 @@ def debug_script(src, pm=False, globs=None):
             # backslashes to get treated as metacharacters on Windows.
             pdb.run("execfile(%r)" % srcfilename, globs, globs)
 
+    finally:
+        os.remove(srcfilename)
+
 def debug(module, name, pm=False):
     """Debug a single doctest docstring.