Merge pull request #1597 from m-ou-se/wrap-pyfunction-as-closure

Expand wrap_pyfunction!() to a closure to improve deduction.

src/lib.rs

@@ -221,7 +221,7 @@ pub mod proc_macro {
 #[macro_export]
 macro_rules! wrap_pyfunction {
     ($function_name: ident) => {{
-        &pyo3::paste::expr! { [<__pyo3_get_function_ $function_name>] }
+        &|py| pyo3::paste::expr! { [<__pyo3_get_function_ $function_name>] }(py)
     }};
 
     ($function_name: ident, $arg: expr) => {

tests/test_wrap_pyfunction_deduction.rs

@@ -0,0 +1,13 @@
+use pyo3::{prelude::*, types::PyCFunction, wrap_pyfunction};
+
+#[pyfunction]
+fn f() {}
+
+pub fn add_wrapped(wrapper: &impl Fn(Python) -> PyResult<&PyCFunction>) {
+    let _ = wrapper;
+}
+
+#[test]
+fn wrap_pyfunction_deduction() {
+    add_wrapped(wrap_pyfunction!(f));
+}