[issue7818] Improve set().test_c_api(): don't expect a set("abc"), modify the content

[STINNER Victor]

Changes by STINNER Victor <victor.stinner at haypocalc.com>:


----------
components: +Interpreter Core
type:  -> crash
versions: +Python 2.7, Python 3.2

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7818>
_______________________________________