From eda3163b9c4865e1c7c4404bd103bd735c9bc8f8 Mon Sep 17 00:00:00 2001
From: Casey Carter <Casey@Carter.net>
Date: Sun, 29 Jan 2023 10:16:07 -0800
Subject: [PATCH 1/2] Speculatively implement LWG-3867

Fixes #3355.
---
 stl/inc/syncstream | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/stl/inc/syncstream b/stl/inc/syncstream
index ffe3cb722e0..469803588d2 100644
--- a/stl/inc/syncstream
+++ b/stl/inc/syncstream
@@ -346,7 +346,7 @@ public:
 
     ~basic_osyncstream() = default;
 
-    basic_osyncstream& operator=(basic_osyncstream&&) noexcept = default;
+    basic_osyncstream& operator=(basic_osyncstream&&) = default; // per LWG-3867
 
     void emit() {
         ios_base::iostate _State = ios_base::goodbit;

From 5f0e3c776301b1308361e936baebe1f64e086bd2 Mon Sep 17 00:00:00 2001
From: "Stephan T. Lavavej" <stl@nuwen.net>
Date: Mon, 30 Jan 2023 09:50:27 -0800
Subject: [PATCH 2/2] Goodbye, squirrels!

---
 tests/std/tests/GH_001858_iostream_exception/test.cpp | 2 --
 1 file changed, 2 deletions(-)

diff --git a/tests/std/tests/GH_001858_iostream_exception/test.cpp b/tests/std/tests/GH_001858_iostream_exception/test.cpp
index 4079c25cf16..5ddb356a1e5 100644
--- a/tests/std/tests/GH_001858_iostream_exception/test.cpp
+++ b/tests/std/tests/GH_001858_iostream_exception/test.cpp
@@ -389,8 +389,6 @@ static_assert(is_nothrow_swappable_v<wstringstream>);
 static_assert(is_nothrow_swappable_v<syncbuf>);
 static_assert(is_nothrow_swappable_v<wsyncbuf>);
 
-// TRANSITION, GH-3355: "<syncstream>: is_nothrow_move_assignable_v<osyncstream> is squirrelly"
-
 static_assert(has_nothrow_rdbuf<osyncstream>); // mandatory
 static_assert(has_nothrow_rdbuf<wosyncstream>); // mandatory
 #endif // _HAS_CXX20