[issue13886] readline-related test_builtin failure

[Martin Panter]

Martin Panter added the comment:

Since people keep coming upon this bug, perhaps we should inhibit push my fix without fixing that other prompt bug (now a feature change I think). Probably have to capture stderr to avoid it coming out in the test output.

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versions: +Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13886>
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