--- a/rust/hg-pyo3/src/exceptions.rs	Fri Jan 24 15:58:18 2025 +0100
+++ b/rust/hg-pyo3/src/exceptions.rs	Fri Jan 24 16:05:16 2025 +0100
@@ -8,6 +8,7 @@
 use crate::revision::PyRevision;
 
 create_exception!(pyo3_rustext, GraphError, PyValueError);
+create_exception!(pyo3_rustext, FallbackError, PyRuntimeError);
 import_exception!(mercurial.error, WdirUnsupported);
 
 impl GraphError {