Change panic::update_hook to simplify usage

And to remove possibility of panics while changing the panic handler,
because that resulted in a double panic.

1 files changed, 4 insertions, 6 deletions

diff --git a/library/alloc/tests/slice.rs b/library/alloc/tests/slice.rs
index a02f7b1f277..b93d7938bc9 100644
--- a/library/alloc/tests/slice.rs
+++ b/library/alloc/tests/slice.rs
@@ -1783,12 +1783,10 @@ thread_local!(static SILENCE_PANIC: Cell<bool> = Cell::new(false));
 #[test]
 #[cfg_attr(target_os = "emscripten", ignore)] // no threads
 fn panic_safe() {
-    panic::update_hook(|prev| {
-        Box::new(move |info| {
-            if !SILENCE_PANIC.with(|s| s.get()) {
-                prev(info);
-            }
-        })
+    panic::update_hook(move |prev, info| {
+        if !SILENCE_PANIC.with(|s| s.get()) {
+            prev(info);
+        }
     });
 
     let mut rng = thread_rng();