"gc_get_refs(gc): -1" debug prints on stdout

[ogrisel]

This is making some scikit-learn tests fail, e.g. in sklearn/experimental/tests/test_enable_iterative_imputer.py the test_imports_strategies test fails because it expects nothing on stdout and stderr but gets:

gc_get_refs(gc): -1
gc_get_refs(gc): -1
gc_get_refs(gc): -1

from https://github.com/colesbury/nogil/blob/nogil/Modules/gcmodule.c#L757

Maybe this is revealing a real bug?

[colesbury]

Yes, I think it's a real bug. I'll look into it.

[colesbury]

This should be fixed now in 87c61c3

[ogrisel]

I confirm that this fixes the failing test.

All scikit-learn tests now pass! 🍾