From 747ce20cc28d62d564ba0a6f0b01e5fef22e93de Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Thu, 31 Oct 2024 21:23:45 -0700
Subject: [PATCH] Remove format var parsing workaround that targeted rustc 1.40
 and older

---
 impl/src/fmt.rs | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/impl/src/fmt.rs b/impl/src/fmt.rs
index b38b7bf1..c036536a 100644
--- a/impl/src/fmt.rs
+++ b/impl/src/fmt.rs
@@ -93,11 +93,6 @@ impl Display<'_> {
             if formatvar.to_string().starts_with("r#") {
                 formatvar = format_ident!("r_{}", formatvar);
             }
-            if formatvar.to_string().starts_with('_') {
-                // Work around leading underscore being rejected by 1.40 and
-                // older compilers. https://github.com/rust-lang/rust/pull/66847
-                formatvar = format_ident!("field_{}", formatvar);
-            }
             out += &formatvar.to_string();
             if !named_args.insert(formatvar.clone()) {
                 // Already specified in the format argument list.