1 files changed, 4 insertions, 0 deletions
diff --git a/lib/Sema/SemaLookup.cpp b/lib/Sema/SemaLookup.cpp
index 16d7305867..8710c496de 100644
--- a/lib/Sema/SemaLookup.cpp
+++ b/lib/Sema/SemaLookup.cpp
@@ -1500,6 +1500,10 @@ addAssociatedClassesAndNamespaces(CXXRecordDecl *Class,
                                   ASTContext &Context,
                             Sema::AssociatedNamespaceSet &AssociatedNamespaces,
                             Sema::AssociatedClassSet &AssociatedClasses) {
+
+  // Some classes are invisible to ADL.
+  if (Class->isInvisibleToADL()) return;
+
   // C++ [basic.lookup.koenig]p2:
   //   [...]
   //     -- If T is a class type (including unions), its associated