From 0355358e6cd106f771392eadae3c0e3f49b17e98 Mon Sep 17 00:00:00 2001
From: cyrgani <ansgar.w.zielke@gmail.com>
Date: Wed, 8 Oct 2025 13:49:32 +0200
Subject: [PATCH] run zero-size assertion in `const {}`

---
 library/proc_macro/src/bridge/selfless_reify.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/proc_macro/src/bridge/selfless_reify.rs b/library/proc_macro/src/bridge/selfless_reify.rs
index b06434a5ffee..a53550e0b9e0 100644
--- a/library/proc_macro/src/bridge/selfless_reify.rs
+++ b/library/proc_macro/src/bridge/selfless_reify.rs
@@ -50,7 +50,7 @@ macro_rules! define_reify_functions {
         >(f: F) -> $(extern $abi)? fn($($arg_ty),*) -> $ret_ty {
             // FIXME(eddyb) describe the `F` type (e.g. via `type_name::<F>`) once panic
             // formatting becomes possible in `const fn`.
-            assert!(size_of::<F>() == 0, "selfless_reify: closure must be zero-sized");
+            const { assert!(size_of::<F>() == 0, "selfless_reify: closure must be zero-sized"); }
 
             $(extern $abi)? fn wrapper<
                 $($($param,)*)?