diff --git a/clang/include/clang/Sema/DeclSpec.h b/clang/include/clang/Sema/DeclSpec.h
--- a/clang/include/clang/Sema/DeclSpec.h
+++ b/clang/include/clang/Sema/DeclSpec.h
@@ -516,7 +516,8 @@
   SourceLocation getTypeSpecSatLoc() const { return TSSatLoc; }
 
   SourceLocation getTypeSpecTypeNameLoc() const {
-    assert(isDeclRep((TST) TypeSpecType) || TypeSpecType == TST_typename);
+    assert(isDeclRep((TST)TypeSpecType) || isTypeRep((TST)TypeSpecType) ||
+           isExprRep((TST)TypeSpecType));
     return TSTNameLoc;
   }
 
diff --git a/clang/test/Sema/typerep-typespec.c b/clang/test/Sema/typerep-typespec.c
new file mode 100644
--- /dev/null
+++ b/clang/test/Sema/typerep-typespec.c
@@ -0,0 +1,7 @@
+// RUN: %clang_cc1 -std=c11 -x c %s -fsyntax-only -verify
+// REQUIRES: asserts
+
+struct dispatch_object_s;
+void _dispatch_queue_get_head(struct dispatch_object_s * volatile dq_items_head) {
+  (_Atomic __typeof__(dq_items_head) *)0; // expected-warning{{expression result unused}}
+}