Index: include/clang/AST/UnresolvedSet.h
===================================================================
--- include/clang/AST/UnresolvedSet.h
+++ include/clang/AST/UnresolvedSet.h
@@ -59,8 +59,9 @@
   // UnresolvedSet.
 private:
   template <unsigned N> friend class UnresolvedSet;
-  UnresolvedSetImpl() {}
-  UnresolvedSetImpl(const UnresolvedSetImpl &) {}
+  UnresolvedSetImpl() = default;
+  UnresolvedSetImpl(const UnresolvedSetImpl &) = default;
+  UnresolvedSetImpl& operator=(const UnresolvedSetImpl &) = default;
 
 public:
   // We don't currently support assignment through this iterator, so we might
Index: include/clang/Sema/Lookup.h
===================================================================
--- include/clang/Sema/Lookup.h
+++ include/clang/Sema/Lookup.h
@@ -185,6 +185,9 @@
       Shadowed(false)
   {}
 
+  LookupResult(const LookupResult &) = default;
+  LookupResult & operator=(const LookupResult &) = default;
+
   ~LookupResult() {
     if (Diagnose) diagnose();
     if (Paths) deletePaths(Paths);