add List::as_slice

diff --git a/compiler/rustc_middle/src/ty/list.rs b/compiler/rustc_middle/src/ty/list.rs
index db3b5cfd180565e9094b471132459ccd6a9b18b0..79365ef281be792d2b9caa72912ad25c2bae60d2 100644 (file)
--- a/compiler/rustc_middle/src/ty/list.rs
+++ b/compiler/rustc_middle/src/ty/list.rs
@@ -65,6 +65,10 @@ pub fn empty<'a>() -> &'a List<T> {
     pub fn len(&self) -> usize {
         self.len
     }
+
+    pub fn as_slice(&self) -> &[T] {
+        self
+    }
 }
 
 impl<T: Copy> List<T> {