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
--- 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),
+ ),
}
}