Fix bad variable name in r73846.
diff --git a/Lib/test/test_py3kwarn.py b/Lib/test/test_py3kwarn.py
index a636a49..c7fdd6b 100644
--- a/Lib/test/test_py3kwarn.py
+++ b/Lib/test/test_py3kwarn.py
@@ -282,8 +282,8 @@
     def test_operator(self):
         from operator import isCallable, sequenceIncludes
 
-        expected_ = ("operator.isCallable() is not supported in 3.x. "
-                     "Use hasattr(obj, '__call__').")
+        callable_warn = ("operator.isCallable() is not supported in 3.x. "
+                         "Use hasattr(obj, '__call__').")
         seq_warn = ("operator.sequenceIncludes() is not supported "
                     "in 3.x. Use operator.contains().")
         with check_warnings() as w: