[issue17490] Improve ast.literal_eval test suite coverage

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I agreed with Raymond, the current version of the code looks clearer.

----------
nosy: +serhiy.storchaka

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17490>
_______________________________________