From ed1439cea48144dcdfee84ccd8d7b0d0edb9f64e Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Mon, 27 Jul 2020 11:22:36 +0200
Subject: [PATCH] Fix RefUnwindSafe & UnwinsSafe impls for lazy::SyncLazy

The logic here is the same as for Send&Sync impls.
---
 library/std/src/lazy.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/library/std/src/lazy.rs b/library/std/src/lazy.rs
index 1705a4f77c555..60eba96bcc015 100644
--- a/library/std/src/lazy.rs
+++ b/library/std/src/lazy.rs
@@ -451,7 +451,9 @@ unsafe impl<T, F: Send> Sync for SyncLazy<T, F> where SyncOnceCell<T>: Sync {}
 // auto-derived `Send` impl is OK.
 
 #[unstable(feature = "once_cell", issue = "74465")]
-impl<T, F: RefUnwindSafe> RefUnwindSafe for SyncLazy<T, F> where SyncOnceCell<T>: RefUnwindSafe {}
+impl<T, F: UnwindSafe> RefUnwindSafe for SyncLazy<T, F> where SyncOnceCell<T>: RefUnwindSafe {}
+#[unstable(feature = "once_cell", issue = "74465")]
+impl<T, F: UnwindSafe> UnwindSafe for SyncLazy<T, F> where SyncOnceCell<T>: UnwindSafe {}
 
 impl<T, F> SyncLazy<T, F> {
     /// Creates a new lazy value with the given initializing