Showcase of PyO3/pyo3#340 and PyO3/pyo3#341.

.gitignore

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+/target
+Cargo.lock

Cargo.toml

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+[package]
+name = "pyo3bug"
+version = "0.1.0"
+authors = ["Manuel Vázquez Acosta <manuel@merchise.org>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[lib]
+name = "pyo3bug"
+crate-type = ["cdylib"]
+
+
+[dependencies.pyo3]
+git = "https://github.com/PyO3/pyo3"
+features = ["extension-module", "python3"]

rust-toolchain

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+nightly

src/lib.rs

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+use pyo3::prelude::*;
+
+#[pymodule]
+fn pyo3bug(_py: Python, _m: &PyModule) -> PyResult<()> {
+    Ok(())
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use pyo3::types::{IntoPyDict, PyDateTime};
+
+    #[test]
+    fn pydelta_conversion() {
+        let gil = Python::acquire_gil();
+        let py = gil.python();
+        let datetime = py.import("datetime").unwrap();
+        let locals = [("datetime", datetime)].into_py_dict(py);
+        let now: &PyDateTime = py
+            .eval("datetime.datetime.utcnow()", None, Some(&locals))
+            .unwrap()
+            .downcast()
+            .unwrap();
+        println!("{:?}", now);
+    }
+}