From 9a204509d2fe9d0ea72cb79ed6e341de7a3bcacb Mon Sep 17 00:00:00 2001
From: Oli Scherer <git-spam-no-reply9815368754983@oli-obk.de>
Date: Mon, 11 Jul 2022 10:34:01 +0000
Subject: [PATCH] Show sizes in error output

---
 src/test/ui/layout/unsafe-cell-hides-niche.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/test/ui/layout/unsafe-cell-hides-niche.rs b/src/test/ui/layout/unsafe-cell-hides-niche.rs
index 7fb55d8219ef..21ff0cb1e552 100644
--- a/src/test/ui/layout/unsafe-cell-hides-niche.rs
+++ b/src/test/ui/layout/unsafe-cell-hides-niche.rs
@@ -18,10 +18,12 @@ struct Transparent<T>(T);
 
 struct NoNiche<T>(UnsafeCell<T>);
 
+struct Size<const S: usize>;
+
 // Overwriting the runtime assertion and making it a compile-time assertion
 macro_rules! assert_size {
     ($a:ty, $b:literal) => {{
-        const _: () = assert!(std::mem::size_of::<$a>() == $b);
+        const _: Size::<$b> = Size::<{std::mem::size_of::<$a>()}>;
     }};
 }