From 947116513200c9523c3c7e7334cc12f3e1d1a325 Mon Sep 17 00:00:00 2001
From: dualfroz <me@dualfroz.com>
Date: Wed, 2 Sep 2026 10:08:05 +0200
Subject: [PATCH] test(header): assert HeaderMap types are Sync in test_bounds

The check_bounds helper used a duplicated Send bound (Send + Send), so
the intended Sync assertion was never enforced and the test silently
checked Send only. Use Send + Sync so the test fails to compile if any
of the HeaderMap iterator or entry types ever stops being Sync.

Refs https://github.com/hyperium/http/issues/783
---
 src/header/map.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/header/map.rs b/src/header/map.rs
index 531da72..08a1b8b 100644
--- a/src/header/map.rs
+++ b/src/header/map.rs
@@ -4026,7 +4026,7 @@ mod as_header_name {
 
 #[test]
 fn test_bounds() {
-    fn check_bounds<T: Send + Send>() {}
+    fn check_bounds<T: Send + Sync>() {}
 
     check_bounds::<HeaderMap<()>>();
     check_bounds::<Iter<'static, ()>>();