From fa3a4aeae5f3a4c403bf07038c56e74df3d9df70 Mon Sep 17 00:00:00 2001
From: Santiago Pastorino <spastorino@gmail.com>
Date: Tue, 15 Oct 2019 12:55:39 -0300
Subject: [PATCH] Implement AsRef<[T]> for List<T>

---
 src/librustc/ty/mod.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/librustc/ty/mod.rs b/src/librustc/ty/mod.rs
index 3692caada577c..e74f8fb074f74 100644
--- a/src/librustc/ty/mod.rs
+++ b/src/librustc/ty/mod.rs
@@ -700,6 +700,13 @@ impl<T> Deref for List<T> {
     type Target = [T];
     #[inline(always)]
     fn deref(&self) -> &[T] {
+        self.as_ref()
+    }
+}
+
+impl<T> AsRef<[T]> for List<T> {
+    #[inline(always)]
+    fn as_ref(&self) -> &[T] {
         unsafe {
             slice::from_raw_parts(self.data.as_ptr(), self.len)
         }