1 files changed, 1 insertions, 0 deletions
diff --git a/lib/Sema/Sema.cpp b/lib/Sema/Sema.cpp
index d36b67aed8..b8dec3cb6b 100644
--- a/lib/Sema/Sema.cpp
+++ b/lib/Sema/Sema.cpp
@@ -252,6 +252,7 @@ ExprResult Sema::ImpCastExprToType(Expr *E, QualType Ty,
       break;
     }
   }
+  assert((VK == VK_RValue || !E->isRValue()) && "can't cast rvalue to lvalue");
 #endif
 
   QualType ExprTy = Context.getCanonicalType(E->getType());