Tester.__init__(): this couldn't possibly work when a module argument
was passed.
diff --git a/Lib/doctest.py b/Lib/doctest.py
index d77fe15..587753e 100644
--- a/Lib/doctest.py
+++ b/Lib/doctest.py
@@ -1957,7 +1957,7 @@
DeprecationWarning, stacklevel=2)
if mod is None and globs is None:
raise TypeError("Tester.__init__: must specify mod or globs")
- if mod is not None and not _ismodule(mod):
+ if mod is not None and not inspect.ismodule(mod):
raise TypeError("Tester.__init__: mod must be a module; %r" %
(mod,))
if globs is None: