From 6b0c2fd1d6caf3317da930912b9dc85ed92747f7 Mon Sep 17 00:00:00 2001
From: Jonas Schievink <jonasschievink@gmail.com>
Date: Sun, 24 Jun 2018 20:11:56 +0200
Subject: [PATCH] Use assert_eq! in copy_from_slice

This will print both lengths when the assertion fails instead of just saying that they're different.
---
 src/libcore/slice/mod.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/libcore/slice/mod.rs b/src/libcore/slice/mod.rs
index 6f4c130d8f318..e4ed5f61d1c79 100644
--- a/src/libcore/slice/mod.rs
+++ b/src/libcore/slice/mod.rs
@@ -1642,8 +1642,8 @@ impl<T> [T] {
     /// [`split_at_mut`]: #method.split_at_mut
     #[stable(feature = "copy_from_slice", since = "1.9.0")]
     pub fn copy_from_slice(&mut self, src: &[T]) where T: Copy {
-        assert!(self.len() == src.len(),
-                "destination and source slices have different lengths");
+        assert_eq!(self.len(), src.len(),
+                   "destination and source slices have different lengths");
         unsafe {
             ptr::copy_nonoverlapping(
                 src.as_ptr(), self.as_mut_ptr(), self.len());