test_alias_nofallback():  Someone broke this test, after 2.3, by converting it into assertRaises() form.  Restored the 2.3 code, and explained why assertRaises() cannot be used instead.
test_alias_nofallback():  Someone broke this test, after 2.3, by
converting it into assertRaises() form.  Restored the 2.3 code, and
explained why assertRaises() cannot be used instead.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator