Index: src/GenPoly/Lvalue.cc
===================================================================
--- src/GenPoly/Lvalue.cc	(revision 31cb252a8222a2548a51e31ed5b88c50fc4d4752)
+++ src/GenPoly/Lvalue.cc	(revision ec6c0404bf8b8104c482a89066bbe8acec0e8d23)
@@ -296,4 +296,5 @@
 				//   int && __ref_tmp_2 = &__ref_tmp_1;
 				//   &__ref_tmp_2;
+				SemanticWarning( castExpr->arg->location, Warning::RvalueToReferenceConversion );
 
 				static UniqueName tempNamer( "__ref_tmp_" );