diff --git a/clang/lib/Parse/ParseCXXInlineMethods.cpp b/clang/lib/Parse/ParseCXXInlineMethods.cpp
--- a/clang/lib/Parse/ParseCXXInlineMethods.cpp
+++ b/clang/lib/Parse/ParseCXXInlineMethods.cpp
@@ -404,6 +404,7 @@
       if (Tok.is(tok::eof) && Tok.getEofData() == Param)
         ConsumeAnyToken();
     } else if (HasUnparsed) {
+      // This is a test to use arc.
       assert(Param->hasInheritedDefaultArg());
       FunctionDecl *Old = cast<FunctionDecl>(LM.Method)->getPreviousDecl();
       ParmVarDecl *OldParam = Old->getParamDecl(I);