Fixing regression test for #517 so it fails on macos too - #522
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jamadden merged 1 commit intoJul 23, 2026
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The test only asked whether the class survived the collection, which a build without the fix can also satisfy: if the attribute lookup happened to take a strong _PyCStackRef instead of a deferred one, or any other reference lingered, the class stays alive and the test passes. That is why it kept passing on mac/3.15b3 while failing on manylinux/3.15b4. Look for the suspended greenlet in gc.get_referrers() of the class instead. That is the reference the fix creates, so a build without it reports the masking reference and fails wherever the class survives for some unrelated reason.
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fix for #517 regression test not replicating in macos. A demo where the test fails in all scenarios can be seen here: ddorian#1