import gc
import sys
import _interpreters


def test_leak():
    id1 = _interpreters.create()

    def f():
        # enable deferred ref counts for sys.flags, causes a leak, even with
        # an explicit gc.collect() call
        _interpreters.run_string(
            id1,
            'import sys, _testcapi; _testcapi.pyobject_enable_deferred_refcount(sys.flags)\n',
        )

    f()
    _interpreters.destroy(id1)


def main():
    for i in range(4):
        test_leak()
    gc.collect()
    old_refs = sys.gettotalrefcount()
    for i in range(10):
        test_leak()
        gc.collect()
        refs = sys.gettotalrefcount()
        print(f'refs {refs} diff {refs-old_refs}')
        old_refs = refs


if __name__ == '__main__':
    main()