[issue28691] python3.6 -Werror -c '"\c"' fails with an assertion error

[STINNER Victor]

STINNER Victor added the comment:

> By the way, an unit test is missing since the bug was not catched by the test suite!

Lib/test/test_string_literals.py contains an unit test but it changes the warnings filter, so -Werror option is ignored.

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<http://bugs.python.org/issue28691>
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