pyo3 0.18.1

Bindings to Python interpreter
Documentation 
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error: Python functions cannot have generic type parameters
 --> tests/ui/invalid_pyfunctions.rs:4:21
  |
4 | fn generic_function<T>(value: T) {}
  |                     ^

error: Python functions cannot have `impl Trait` arguments
 --> tests/ui/invalid_pyfunctions.rs:7:36
  |
7 | fn impl_trait_function(impl_trait: impl AsRef<PyAny>) {}
  |                                    ^^^^

error: `async fn` is not yet supported for Python functions.

       Additional crates such as `pyo3-asyncio` can be used to integrate async Rust and Python. For more information, see https://github.com/PyO3/pyo3/issues/1632
  --> tests/ui/invalid_pyfunctions.rs:10:1
   |
10 | async fn async_function() {}
   | ^^^^^