From c1c13bd07ca476c0d9b53b0fa1384ea8a83962e3 Mon Sep 17 00:00:00 2001
From: Yuri Astrakhan <YuriAstrakhan@gmail.com>
Date: Fri, 19 Jul 2024 11:51:21 -0400
Subject: [PATCH] Avoid ref when using format! in compiler

Clean up a few minor refs in `format!` macro, as it has a performance cost. Apparently the compiler is unable to inline `format!("{}", &variable)`, and does a run-time double-reference instead (format macro already does one level referencing).  Inlining format args prevents accidental `&` misuse.
---
 src/abi/mod.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/abi/mod.rs b/src/abi/mod.rs
index fa0de6f9de5e..ac5aaea561cc 100644
--- a/src/abi/mod.rs
+++ b/src/abi/mod.rs
@@ -505,7 +505,7 @@ pub(crate) fn codegen_terminator_call<'tcx>(
                 let nop_inst = fx.bcx.ins().nop();
                 fx.add_comment(
                     nop_inst,
-                    format!("virtual call; self arg pass mode: {:?}", &fn_abi.args[0]),
+                    format!("virtual call; self arg pass mode: {:?}", fn_abi.args[0]),
                 );
             }