[issue11302] Add more tests to test_ast.py

[Vincent Legoll]

Vincent Legoll <vincent.legoll at gmail.com> added the comment:

* removed the comments for exc msgs
* added explanation to multiline statements
* added 2 tests to test_AST_objects()

Regarding Éric's comment, I'm starting to wonder if those Exception tests should be added to cpython's testsuite. Maybe that would only be beneficial for pypy...

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Added file: http://bugs.python.org/file22496/add-more-tests-for-ast_py-3.patch

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