unable to build pydantic-core on openbsd

[Monallabs]

Trying to build this on openbsd (7.4) which as rust (1.72.1) and maturin (0.13.7). Fails with error:

error[E0446]: crate-private type `extra::Extra<'_>` in public interface
         --> src/serializers/fields.rs:149:5
          |
      149 | /     pub fn main_to_python<'py>(
      150 | |         &self,
      151 | |         py: Python<'py>,
      152 | |         main_iter: impl Iterator<Item = PyResult<(&'py PyAny, &'py PyAny)>>,
      ...   |
      155 | |         extra: Extra,
      156 | |     ) -> PyResult<&'py PyDict> {
          | |______________________________^ can't leak crate-private type
          |
         ::: src/serializers/extra.rs:73:1
          |
      73  |   pub(crate) struct Extra<'a> {
          |   --------------------------- `extra::Extra<'_>` declared as crate-private
      
      error[E0446]: crate-private type `extra::Extra<'_>` in public interface
         --> src/serializers/fields.rs:214:5
          |
      214 | /     pub fn main_serde_serialize<'py, S: serde::ser::Serializer>(
      215 | |         &self,
      216 | |         main_iter: impl Iterator<Item = PyResult<(&'py PyAny, &'py PyAny)>>,
      217 | |         expected_len: usize,
      ...   |
      221 | |         extra: Extra,
      222 | |     ) -> Result<S::SerializeMap, S::Error> {
          | |__________________________________________^ can't leak crate-private type
          |
         ::: src/serializers/extra.rs:73:1
          |
      73  |   pub(crate) struct Extra<'a> {
          |   --------------------------- `extra::Extra<'_>` declared as crate-private
      
      error[E0446]: crate-private type `extra::Extra<'_>` in public interface
         --> src/serializers/fields.rs:260:5
          |
      260 | /     pub fn add_computed_fields_python(
      261 | |         &self,
      262 | |         model: Option<&PyAny>,
      263 | |         output_dict: &PyDict,
      ...   |
      266 | |         extra: &Extra,
      267 | |     ) -> PyResult<()> {
          | |_____________________^ can't leak crate-private type
          |
         ::: src/serializers/extra.rs:73:1
          |
      73  |   pub(crate) struct Extra<'a> {
          |   --------------------------- `extra::Extra<'_>` declared as crate-private
      
      error[E0446]: crate-private type `extra::Extra<'_>` in public interface
         --> src/serializers/fields.rs:277:5
          |
      277 | /     pub fn add_computed_fields_json<S: serde::ser::Serializer>(
      278 | |         &self,
      279 | |         model: Option<&PyAny>,
      280 | |         map: &mut S::SerializeMap,
      ...   |
      283 | |         extra: &Extra,
      284 | |     ) -> Result<(), S::Error> {
          | |_____________________________^ can't leak crate-private type
          |
         ::: src/serializers/extra.rs:73:1
          |
      73  |   pub(crate) struct Extra<'a> {
          |   --------------------------- `extra::Extra<'_>` declared as crate-private
      
      For more information about this error, try `rustc --explain E0446`.
      error: could not compile `pydantic-core` (lib) due to 4 previous errors
      ð¥ maturin failed
        Caused by: Failed to build a native library through cargo
        Caused by: Cargo build finished with "exit status: 101": `PYO3_ENVIRONMENT_SIGNATURE="cpython-3.12-64bit" PYO3_PYTHON="/home/kabiraatmonallabs/.local/share/virtualenvs/ofjustpy-IRz21Ee9/bin/python" PYTHON_SYS_EXECUTABLE="/home/kabiraatmonallabs/.local/share/virtualenvs/ofjustpy-IRz21Ee9/bin/python" "cargo" "rustc" "--features" "pyo3/extension-module" "--message-format" "json-render-diagnostics" "--manifest-path" "/home/kabiraatmonallabs/Development/ThirdParty/pydantic-core/Cargo.toml" "--release" "--lib" "--crate-type" "cdylib"`
      Error: command ['maturin', 'pep517', 'build-wheel', '-i', '/home/kabiraatmonallabs/.local/share/virtualenvs/ofjustpy-IRz21Ee9/bin/python', '--compatibility', 'off', '--editable'] returned non-zero exit status 1
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
  ERROR: Failed building editable for pydantic_core
Failed to build pydantic_core
ERROR: Could not build wheels for pydantic_core, which is required to install pyproject.toml-based projects
gmake: *** [Makefile:18: install] Error 

[davidhewitt]

Thanks for the report, will close this as duplicate of #1176 (which I think we may aim to write a patch fix for soon).