From 43a865ad540a3d8218eeb62ba4e7f9987cfa1c0e Mon Sep 17 00:00:00 2001
From: joboet <jonasboettiger@icloud.com>
Date: Tue, 25 Jun 2024 23:43:19 +0200
Subject: [PATCH] fix UI test, simplify error message

---
 core/src/fmt/mod.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/core/src/fmt/mod.rs b/core/src/fmt/mod.rs
index c25bc5a1b13c9..3bcd4be183465 100644
--- a/core/src/fmt/mod.rs
+++ b/core/src/fmt/mod.rs
@@ -459,6 +459,12 @@ impl<'a> Arguments<'a> {
     }
 }
 
+// Manually implementing these results in better error messages.
+#[stable(feature = "rust1", since = "1.0.0")]
+impl !Send for Arguments<'_> {}
+#[stable(feature = "rust1", since = "1.0.0")]
+impl !Sync for Arguments<'_> {}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl Debug for Arguments<'_> {
     fn fmt(&self, fmt: &mut Formatter<'_>) -> Result {