Warnings with abi3

[birkenfeld]

I'm getting the following warnings when compiling a small test module with rustc nightly, pyo3 master and features ["abi3", "extension-module"]:

warning: static of uninhabited type
   --> /home/gbr/devel/ext/pyo3/src/ffi/object.rs:631:5
    |
631 |     pub static mut PyType_Type: PyTypeObject;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `#[warn(uninhabited_static)]` on by default
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #74840 <https://github.com/rust-lang/rust/issues/74840>
    = note: uninhabited statics cannot be initialized, and any access would be an immediate error

warning: static of uninhabited type
   --> /home/gbr/devel/ext/pyo3/src/ffi/object.rs:634:5
    |
634 |     pub static mut PyBaseObject_Type: PyTypeObject;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #74840 <https://github.com/rust-lang/rust/issues/74840>
    = note: uninhabited statics cannot be initialized, and any access would be an immediate error

[kngwyu]

Thanks, looks like a new warning?
Pointer for anyone curious: rust-lang/rust#74840

[birkenfeld]

Hm, I wonder how one is to refer to external opaque C objects then...

[birkenfeld]

From https://doc.rust-lang.org/nightly/nomicon/ffi.html#representing-opaque-structs (which is linked in the mentioned issue as the current workaround until we have stable extern type) it seems like:

    #[repr(C)]
    pub struct PyTypeObject([u8; 0]);