From 01f36c51c2b6fd3a95b6cdfacff92725cd81d5b0 Mon Sep 17 00:00:00 2001
From: DrMeepster <19316085+DrMeepster@users.noreply.github.com>
Date: Thu, 17 Dec 2020 09:18:06 -0800
Subject: [PATCH 1/2] fix memory leak in test

---
 library/core/tests/mem.rs | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/library/core/tests/mem.rs b/library/core/tests/mem.rs
index 5e24fa690ef52..86990fa0945a7 100644
--- a/library/core/tests/mem.rs
+++ b/library/core/tests/mem.rs
@@ -250,14 +250,19 @@ fn uninit_write_slice_cloned_mid_panic() {
 
 #[test]
 fn uninit_write_slice_cloned_no_drop() {
-    let rc = Rc::new(());
+    #[derive(Clone)]
+    struct Bomb;
+
+    impl Drop for Bomb {
+        fn drop(&mut self) {
+            panic!("dropped a bomb! kaboom")
+        }
+    }
 
     let mut dst = [MaybeUninit::uninit()];
-    let src = [rc.clone()];
+    let src = [Bomb];
 
     MaybeUninit::write_slice_cloned(&mut dst, &src);
 
-    drop(src);
-
-    assert_eq!(Rc::strong_count(&rc), 2);
+    forget(src);
 }

From 28e0d2f234973059bc0dce2aa4da140b2fae1fca Mon Sep 17 00:00:00 2001
From: DrMeepster <19316085+DrMeepster@users.noreply.github.com>
Date: Fri, 18 Dec 2020 14:53:55 -0800
Subject: [PATCH 2/2] Fix unused import error on wasm

---
 library/core/tests/mem.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/library/core/tests/mem.rs b/library/core/tests/mem.rs
index 86990fa0945a7..5d0fedd4d9ccc 100644
--- a/library/core/tests/mem.rs
+++ b/library/core/tests/mem.rs
@@ -1,5 +1,6 @@
 use core::mem::*;
 
+#[cfg(panic = "unwind")]
 use std::rc::Rc;
 
 #[test]