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import textwrap import unittest from test import support class SubinterpThreadingTests(unittest.TestCase): def test_abc_subinterp(self): code = textwrap.dedent(r""" from _collections_abc import Set import os def noop(*args): pass os.register_at_fork(after_in_child=noop) """) support.run_in_subinterp(code) if __name__ == "__main__": unittest.main()