[issue19712] Make sure there are exec_module tests for _LoaderBasics subclasses

[Roundup Robot]

Roundup Robot added the comment:

New changeset 07ef52e751f3 by Brett Cannon in branch 'default':
Issue #19712: Update test.test_importlib.source for PEP 451
http://hg.python.org/cpython/rev/07ef52e751f3

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<http://bugs.python.org/issue19712>
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