[issue17490] Improve ast.literal_eval test suite coverage

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Nick, do you mind to create a PR for new tests?

Some additional tests were added since this issue was created.

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