From eea99f491b6000a836a8887a29d1ce85c666fe47 Mon Sep 17 00:00:00 2001
From: Xavientois <joshua.rampersad@hotmail.com>
Date: Fri, 15 Jan 2021 18:45:00 -0500
Subject: [PATCH] Add default keyword for specialization

---
 library/std/src/io/mod.rs | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/library/std/src/io/mod.rs b/library/std/src/io/mod.rs
index 53da2440945..712e808a024 100644
--- a/library/std/src/io/mod.rs
+++ b/library/std/src/io/mod.rs
@@ -2481,10 +2481,6 @@ impl<R: Read + SizeHint> Iterator for Bytes<R> {
 
 #[stable(feature = "bufreader_size_hint", since = "1.51.0")]
 trait SizeHint {
-    fn lower_bound(&self) -> usize {
-        0
-    }
-
     fn upper_bound(&self) -> Option<usize> {
         None
     }
@@ -2495,7 +2491,11 @@ trait SizeHint {
 }
 
 #[stable(feature = "bufreader_size_hint", since = "1.51.0")]
-impl<T> SizeHint for T {}
+impl<T> SizeHint for T {
+    default fn lower_bound(&self) -> usize {
+        0
+    }
+}
 
 #[stable(feature = "bufreader_size_hint", since = "1.51.0")]
 impl<T> SizeHint for BufReader<T> {