diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index cbcd5e8f74b9..48131f940af2 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -2315,6 +2315,7 @@ public:
   bool VisitIntegerLiteral(const IntegerLiteral *E) { return false; }
   bool VisitFloatingLiteral(const FloatingLiteral *E) { return false; }
   bool VisitStringLiteral(const StringLiteral *E) { return false; }
+  bool VisitObjCStringLiteral(const ObjCStringLiteral *E) { return false; }
   bool VisitCharacterLiteral(const CharacterLiteral *E) { return false; }
   bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E)
     { return false; }
diff --git a/clang/test/SemaObjC/unused.m b/clang/test/SemaObjC/unused.m
index 975b9a96a773..5c7542bf4738 100644
--- a/clang/test/SemaObjC/unused.m
+++ b/clang/test/SemaObjC/unused.m
@@ -51,3 +51,5 @@ void test2() {
 }
 @end
 
+// rdar://10777111
+static NSString *x = @"hi"; // expected-warning {{unused variable 'x'}}