--- a/rust/hg-cpython/src/exceptions.rs	Fri Jan 17 15:43:46 2020 +0100
+++ b/rust/hg-cpython/src/exceptions.rs	Fri Jan 17 15:09:02 2020 +0100
@@ -40,3 +40,5 @@
 }
 
 py_exception!(rustext, HgPathPyError, RuntimeError);
+py_exception!(rustext, FallbackError, RuntimeError);
+py_exception!(shared_ref, AlreadyBorrowed, RuntimeError);