pyo3/tests/ui/invalid_closure.rs

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use pyo3::prelude::*;
use pyo3::types::{PyCFunction, PyDict, PyTuple};
fn main() {
let fun: Py<PyCFunction> = Python::with_gil(|py| {
let local_data = vec![0, 1, 2, 3, 4];
let ref_: &[u8] = &local_data;
let closure_fn = |_args: &PyTuple, _kwargs: Option<&PyDict>| -> PyResult<()> {
println!("This is five: {:?}", ref_.len());
Ok(())
};
PyCFunction::new_closure(py, None, None, closure_fn).unwrap().into()
});
Python::with_gil(|py| {
fun.call0(py).unwrap();
});
}