# HG changeset patch
# User Raphaël Gomès <rgomes@octobus.net>
# Date 1621611473 -7200
# Node ID 33e7508b0ae9170b44f07a1ba7679e7cd4909d42
# Parent  73f52278a15808317706522c246993fa8ed7851a
hg-cpython: fix new occuring TypeError

dd339191f2dc introduced a minor refactoring of error types that highlighted
a fragile error creation mechanism that was in place in the Rust `MixedIndex`.

`PyErr::from_instance` also accepts a Python class, as long as it's an
`Exception` class. Before the aforementioned commit, we never ran into a case
where this duck-typing mechanism failed. We rectify this behavior by doing the
instantiation ourselves.

Differential Revision: https://phab.mercurial-scm.org/D10764

diff -r 73f52278a158 -r 33e7508b0ae9 rust/hg-cpython/src/revlog.rs
--- a/rust/hg-cpython/src/revlog.rs	Thu May 20 08:15:57 2021 -0700
+++ b/rust/hg-cpython/src/revlog.rs	Fri May 21 17:37:53 2021 +0200
@@ -469,7 +469,10 @@
         .and_then(|m| m.get(py, "RevlogError"))
     {
         Err(e) => e,
-        Ok(cls) => PyErr::from_instance(py, cls),
+        Ok(cls) => PyErr::from_instance(
+            py,
+            cls.call(py, (py.None(),), None).ok().into_py_object(py),
+        ),
     }
 }