1 files changed, 4 insertions, 1 deletions
diff --git a/lib/Sema/SemaTemplateInstantiate.cpp b/lib/Sema/SemaTemplateInstantiate.cpp
index 1943a2ae17..a2bd37c0bb 100644
--- a/lib/Sema/SemaTemplateInstantiate.cpp
+++ b/lib/Sema/SemaTemplateInstantiate.cpp
@@ -1446,7 +1446,10 @@ Sema::InstantiateClassMembers(SourceLocation PointOfInstantiation,
         }
       }      
     } else if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(*D)) {
-      if (Record->isInjectedClassName())
+      // Always skip the injected-class-name, along with any
+      // redeclarations of nested classes, since both would cause us
+      // to try to instantiate the members of a class twice.
+      if (Record->isInjectedClassName() || Record->getPreviousDeclaration())
         continue;
       
       MemberSpecializationInfo *MSInfo = Record->getMemberSpecializationInfo();