From e28f6abf588f51a21d1db638e460f9c086c08db4 Mon Sep 17 00:00:00 2001
From: Douglas Gregor <dgregor@apple.com>
Date: Wed, 30 Jan 2013 02:10:08 +0000
Subject: [PATCH] Unresolved lookups can have using declarations that refer to
 unresolved using declarations. Fixes PR14768 / <rdar://problem/13030296>.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173883 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/clang/Sema/Lookup.h                              | 2 +-
 test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p10.cpp | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/include/clang/Sema/Lookup.h b/include/clang/Sema/Lookup.h
index 68b36e7d3c..3e7e3a16eb 100644
--- a/include/clang/Sema/Lookup.h
+++ b/include/clang/Sema/Lookup.h
@@ -625,7 +625,7 @@ private:
 
   bool sanityCheckUnresolved() const {
     for (iterator I = begin(), E = end(); I != E; ++I)
-      if (isa<UnresolvedUsingValueDecl>(*I))
+      if (isa<UnresolvedUsingValueDecl>((*I)->getUnderlyingDecl()))
         return true;
     return false;
   }
diff --git a/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p10.cpp b/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p10.cpp
index ae40062fe1..a38ff15525 100644
--- a/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p10.cpp
+++ b/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p10.cpp
@@ -33,3 +33,12 @@ namespace test1 {
   }
 }
 
+// PR 14768
+namespace PR14768 {
+  template<typename eT> class Mat;
+  template<typename eT> class Col : public Mat<eT>   {
+    using Mat<eT>::operator();
+    using Col<eT>::operator();
+    void operator() ();
+  };
+}
-- 
2.50.1