From 14df54989aecb437e9cf6f3e066553cfbc979e26 Mon Sep 17 00:00:00 2001
From: Chris MacNaughton <chris.macnaughton@canonical.com>
Date: Thu, 22 Jun 2017 12:01:22 +0200
Subject: Ensure Guard types impl Display & Debug

Fixes #24372
---
 src/libcore/cell.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'src/libcore')

diff --git a/src/libcore/cell.rs b/src/libcore/cell.rs
index e75401f6ce0..1eebf67ad04 100644
--- a/src/libcore/cell.rs
+++ b/src/libcore/cell.rs
@@ -942,6 +942,13 @@ impl<'b, T: ?Sized> Ref<'b, T> {
 #[unstable(feature = "coerce_unsized", issue = "27732")]
 impl<'b, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<Ref<'b, U>> for Ref<'b, T> {}
 
+#[stable(feature = "std_guard_impls", since = "1.20")]
+impl<'a, T: ?Sized + fmt::Display> fmt::Display for Ref<'a, T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        self.value.fmt(f)
+    }
+}
+
 impl<'b, T: ?Sized> RefMut<'b, T> {
     /// Make a new `RefMut` for a component of the borrowed data, e.g. an enum
     /// variant.
@@ -1034,6 +1041,13 @@ impl<'b, T: ?Sized> DerefMut for RefMut<'b, T> {
 #[unstable(feature = "coerce_unsized", issue = "27732")]
 impl<'b, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<RefMut<'b, U>> for RefMut<'b, T> {}
 
+#[stable(feature = "std_guard_impls", since = "1.20")]
+impl<'a, T: ?Sized + fmt::Display> fmt::Display for RefMut<'a, T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        self.value.fmt(f)
+    }
+}
+
 /// The core primitive for interior mutability in Rust.
 ///
 /// `UnsafeCell<T>` is a type that wraps some `T` and indicates unsafe interior operations on the
-- 
cgit 1.4.1-3-g733a5