Auto merge of #21680 - japaric:slice, r=alexcrichton

Replaces `slice_*` method calls with slicing syntax, and removes `as_slice()` calls that are redundant due to `Deref`.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libcoretest/str.rs b/src/libcoretest/str.rs
index 1c0af55370d..3d89b26be04 100644
--- a/src/libcoretest/str.rs
+++ b/src/libcoretest/str.rs
@@ -19,7 +19,7 @@ fn check_contains_all_substrings(s: &str) {
     assert!(s.contains(""));
     for i in range(0, s.len()) {
         for j in range(i+1, s.len() + 1) {
-            assert!(s.contains(s.slice(i, j)));
+            assert!(s.contains(&s[i..j]));
         }
     }
 }