Index: src/GenPoly/InstantiateGeneric.cc
===================================================================
--- src/GenPoly/InstantiateGeneric.cc	(revision f9941ff08adf6cc1d6d77e61ea910cc9f82ecbce)
+++ src/GenPoly/InstantiateGeneric.cc	(revision 760ba6722ab5edcb4d7c884be81fbda47db05c7e)
@@ -278,5 +278,6 @@
 		substituteMembers( base->get_members(), baseParams, typeSubs );
 
-		deleteAll( baseParams );
+		// xxx - can't delete type parameters because they may have assertions that are used
+		// deleteAll( baseParams );
 		baseParams.clear();