From 9134f8163fc423d76f0b427bdc057923260b4554 Mon Sep 17 00:00:00 2001
From: Hugh Bellamy <hughbellars@gmail.com>
Date: Tue, 29 Nov 2016 16:35:37 +0000
Subject: [PATCH] Fix compiler crash building APINotesYAMLCompiler in
 swift-clang with MSVC

---
 lib/APINotes/APINotesYAMLCompiler.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/APINotes/APINotesYAMLCompiler.cpp b/lib/APINotes/APINotesYAMLCompiler.cpp
index 0ac0b6d65b7..337e76cea76 100644
--- a/lib/APINotes/APINotesYAMLCompiler.cpp
+++ b/lib/APINotes/APINotesYAMLCompiler.cpp
@@ -164,7 +164,7 @@ namespace {
     AvailabilityItem() : Mode(APIAvailability::Available), Msg("") {}
   };
 
-  static llvm::Optional<NullabilityKind> AbsentNullability = llvm::None;
+  static llvm::Optional<NullabilityKind> AbsentNullability {};
   static llvm::Optional<NullabilityKind> DefaultNullability =
     NullabilityKind::NonNull;
   typedef std::vector<clang::NullabilityKind> NullabilitySeq;