Cargo Patches

This directory contains local Cargo patches for third-party crates when the workspace must keep a specific upstream version but needs a small compatibility fix.

These patches are temporary. Remove them when the upstream crate supports the required dependency version and the v2 Python package layout no longer needs the legacy compatibility path.

pyo3-stub-gen

pyo3-stub-gen stays pinned to 0.20.0 because later versions reject module paths outside the pymodule root. The current stub workflow still supports two paths:

• The legacy Cython-compatible package layout.
• The v2 package layout without the nautilus_pyo3 namespace.

The crate is licensed as MIT OR Apache-2.0. The local copy includes the upstream LICENSE-MIT and LICENSE-APACHE texts from Jij-Inc/pyo3-stub-gen.

The vendored crate path is excluded from pre-commit and Ruff style checks so those checks do not rewrite upstream files. Keep local edits limited to the compatibility changes listed below.

The local patch keeps pyo3-stub-gen 0.20.0 buildable with pyo3 0.29.0. It changes only the PyO3 compatibility surface:

• src/util.rs: replaces three removed Bound<PyAny>::downcast::<T>() calls with cast::<T>() for PyDict, PyList, and PyTuple.
• src/exception.rs: removes the PyEnvironmentError and PyIOError stub type impls. PyO3 0.29 aliases both names to PyOSError, so keeping those impls creates duplicate trait impls for the same concrete type.

The patch does not intentionally change generated stub layout, class relocation, module naming, or signature normalization. Those behaviors stay controlled by python/generate_stubs.py and the pinned pyo3-stub-gen 0.20.0 code.

Do not update pyo3-stub-gen or remove this patch until stub generation no longer depends on the dual-path layout.