1 files changed, 12 insertions, 0 deletions
diff --git a/include/clang/Sema/ExternalSemaSource.h b/include/clang/Sema/ExternalSemaSource.h
index 6d7bc63..e2b083e 100644
--- a/include/clang/Sema/ExternalSemaSource.h
+++ b/include/clang/Sema/ExternalSemaSource.h
@@ -20,6 +20,8 @@ namespace clang {
 
 struct ObjCMethodList;
 class Sema;
+class Scope;
+class LookupResult;
 
 /// \brief An abstract interface that should be implemented by
 /// external AST sources that also provide information for semantic
@@ -47,6 +49,16 @@ public:
   /// instance and factory methods, respectively, with this selector.
   virtual std::pair<ObjCMethodList,ObjCMethodList> ReadMethodPool(Selector Sel);
 
+  /// \brief Do last resort, unqualified lookup on a LookupResult that
+  /// Sema cannot find.
+  ///
+  /// \param R a LookupResult that is being recovered.
+  ///
+  /// \param S the Scope of the identifier occurrence.
+  ///
+  /// \return true to tell Sema to recover using the LookupResult.
+  virtual bool LookupUnqualified(LookupResult &R, Scope *S) { return false; }
+
   // isa/cast/dyn_cast support
   static bool classof(const ExternalASTSource *Source) {
     return Source->SemaSource;