remove error checks already done in set_context()
diff --git a/Lib/test/test_genexps.py b/Lib/test/test_genexps.py
index 17ad78a..3d896a5 100644
--- a/Lib/test/test_genexps.py
+++ b/Lib/test/test_genexps.py
@@ -144,7 +144,7 @@
     Traceback (most recent call last):
        ...
       File "<doctest test.test_genexps.__test__.doctests[41]>", line 1
-    SyntaxError: augmented assignment to generator expression not possible
+    SyntaxError: can't assign to generator expression
 
 
 ########### Tests borrowed from or inspired by test_generators.py ############