stop leaking PyMethodDef
inside macro-generated code
#5459
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Fixes #5127
This PR tweaks the internal machinery of
#[pyfunction]
slightly to avoid needing to leakffi::PyMethodDef
structures inside the macro-generated code.This is done by:
#[pyfunction]
to store a staticffi::PyMethodDef
(wrapped as aPyFunctionDef
newtype to beSync
).PyCFunction::internal_new
and replacing it withpyo3::impl_::pyfunction::create_py_c_function
PyCFunction::new
andPyCFunction::new_with_keywords
still leak, we should probably open a follow-up issue to track that. I don't see a way to avoid other than replace those APIs with a better alternative.