Rollup merge of #52769 - sinkuu:stray_test, r=alexcrichton

Incorporate a stray test

`liballoc/repeat-generic-slice.rs` doesn't seem to be tested (I think it was intended to be placed in `run-pass`). This PR incorporates the test into `liballoc/tests`.

src/liballoc/repeat-generic-slice.rs

@@ -1,19 +0,0 @@
-// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-#![feature(repeat_generic_slice)]
-
-fn main() {
-    assert_eq!([1, 2].repeat(2), vec![1, 2, 1, 2]);
-    assert_eq!([1, 2, 3, 4].repeat(0), vec![]);
-    assert_eq!([1, 2, 3, 4].repeat(1), vec![1, 2, 3, 4]);
-    assert_eq!([1, 2, 3, 4].repeat(3),
-               vec![1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4]);
-}

src/liballoc/tests/lib.rs

@@ -24,6 +24,7 @@
 #![feature(try_reserve)]
 #![feature(unboxed_closures)]
 #![feature(exact_chunks)]
+#![feature(repeat_generic_slice)]
 
 extern crate alloc_system;
 extern crate core;

src/liballoc/tests/slice.rs

@@ -1529,3 +1529,14 @@ fn panic_safe() {
         }
     }
 }
+
+#[test]
+fn repeat_generic_slice() {
+    assert_eq!([1, 2].repeat(2), vec![1, 2, 1, 2]);
+    assert_eq!([1, 2, 3, 4].repeat(0), vec![]);
+    assert_eq!([1, 2, 3, 4].repeat(1), vec![1, 2, 3, 4]);
+    assert_eq!(
+        [1, 2, 3, 4].repeat(3),
+        vec![1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4]
+    );
+}