--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rust/hg-cpython/src/debug.rs	Thu Mar 05 10:24:10 2020 +0100
@@ -0,0 +1,26 @@
+// debug.rs
+//
+// Copyright 2020 Raphaël Gomès <rgomes@octobus.net>
+//
+// This software may be used and distributed according to the terms of the
+// GNU General Public License version 2 or any later version.
+
+//! Module to get debug information about Rust extensions.
+use cpython::{PyDict, PyModule, PyResult, Python};
+
+/// Create the module, with `__package__` given from parent
+pub fn init_module(py: Python, package: &str) -> PyResult<PyModule> {
+    let dotted_name = &format!("{}.debug", package);
+    let m = PyModule::new(py, dotted_name)?;
+
+    m.add(py, "__package__", package)?;
+    m.add(py, "__doc__", "Rust debugging information")?;
+
+    m.add(py, "re2_installed", cfg!(feature = "with-re2"))?;
+
+    let sys = PyModule::import(py, "sys")?;
+    let sys_modules: PyDict = sys.get(py, "modules")?.extract(py)?;
+    sys_modules.set_item(py, dotted_name, &m)?;
+
+    Ok(m)
+}