From 1c56b5d1d8307efd12519556e41fc50c5371f136 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Mon, 17 Jun 2019 14:23:04 -0700
Subject: [PATCH] [serialize] Fix copy() calling operator=

https://github.com/googlefonts/harfbuzz/commit/9f610ae239a11e86f94621e26bc15849b65ce41b#commitcomment-33944686
---
 src/hb-serialize.hh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/hb-serialize.hh b/src/hb-serialize.hh
index 76f7016..5764a90 100644
--- a/src/hb-serialize.hh
+++ b/src/hb-serialize.hh
@@ -375,7 +375,7 @@ struct hb_serialize_context_t
   (Type *, src.copy (this, hb_forward<Ts> (ds)...))
 
   template <typename Type> auto
-  _copy (const Type &src, hb_priority<0>) -> decltype (&(src = src))
+  _copy (const Type &src, hb_priority<0>) -> decltype (&(hb_declval<Type> () = src))
   {
     Type *ret = this->allocate_size<Type> (sizeof (Type));
     if (unlikely (!ret)) return nullptr;
-- 
2.7.4