From 9f25a04498fbe30dcf6a9c764953704c333a0137 Mon Sep 17 00:00:00 2001
From: Mara Bos <m-ou.se@m-ou.se>
Date: Tue, 19 Mar 2024 14:58:40 +0100
Subject: [PATCH] SeqCst->Relaxed for FIRST_PANIC.

Relaxed is enough to make sure this `swap` results in `true` only once.
---
 library/std/src/panicking.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/std/src/panicking.rs b/library/std/src/panicking.rs
index 464a46264cbdd..b0bcab7994c76 100644
--- a/library/std/src/panicking.rs
+++ b/library/std/src/panicking.rs
@@ -272,7 +272,7 @@ fn default_hook(info: &PanicInfo<'_>) {
                 drop(backtrace::print(err, crate::backtrace_rs::PrintFmt::Full))
             }
             Some(BacktraceStyle::Off) => {
-                if FIRST_PANIC.swap(false, Ordering::SeqCst) {
+                if FIRST_PANIC.swap(false, Ordering::Relaxed) {
                     let _ = writeln!(
                         err,
                         "note: run with `RUST_BACKTRACE=1` environment variable to display a \