--- a/rust/hg-cpython/src/exceptions.rs	Tue Jul 09 14:53:34 2019 +0200
+++ b/rust/hg-cpython/src/exceptions.rs	Tue Jul 09 15:15:54 2019 +0200
@@ -67,3 +67,5 @@
         }
     }
 }
+
+py_exception!(shared_ref, AlreadyBorrowed, RuntimeError);