initconfig interface when abi feature set

[gar1t]

When I set any of the abi features the interface defined in pyo3_ffi::cpython::initconfig becomes unavailable. I'm trying to use the PyConfig C API, which is added in 3.8.

My crate dep:

pyo3 = { version = "0.27.2", features = ["abi3-py310"] }

On build:

error[E0412]: cannot find type `PyConfig` in module `ffi`
   --> src/py.rs:112:30
    |
112 |         let mut config: ffi::PyConfig = std::mem::zeroed();
    |                              ^^^^^^^^ not found in `ffi`

When I remove the feature flag I can build successfully.

I've read #1474 but this discusses safe wrappers. Looking at the pyo3 source, it's not clear to me why the entire API becomes unavailable when a feature flag is set (I see various attrs that are feature gated for the applicable abi versions).

I feel like I'm missing something obvious here.

[alex]

It's because those functions aren't part of the stable ABI, and the abi3 feature restricts you to stable features: https://docs.python.org/3/c-api/stable.html#contents-of-limited-api