Fix doctest failure introduced by r57949.

gvanrossum · gvanrossum · commit fd4a7de172c7 · 2007-09-05T03:26:38.000Z
The formatting of errors from pdb's own print command is different
from the formatting of errors when pdb exec's an arbitrary command;
the introduction of print as a pdb command caused this test to use
the former instead of the latter, causing the test to fail.
diff --git a/Lib/test/test_doctest.py b/Lib/test/test_doctest.py
@@ -1792,7 +1792,7 @@ def test_pdb_set_trace_nested():
     > <doctest foo[1]>(1)<module>()
     -> calls_set_trace()
     (Pdb) print(foo)
-    *** NameError: name 'foo' is not defined
+    *** NameError: NameError("name 'foo' is not defined",)
     (Pdb) continue
     (0, 2)
 """
