From 281a20247021e55a233e140577162d78aff286db Mon Sep 17 00:00:00 2001
From: Nicholas Nethercote <n.nethercote@gmail.com>
Date: Sat, 10 May 2025 09:39:04 +1000
Subject: [PATCH] Make the assertion in `Ident::new` debug-only.

This fixes a perf regression introduced in #140252.

(cherry picked from commit 4cb9f0309d6e85e6d4bef42321b06ad299e3ef27)
---
 compiler/rustc_span/src/symbol.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs
index f2f6d1a3bcf8..453430793b04 100644
--- a/compiler/rustc_span/src/symbol.rs
+++ b/compiler/rustc_span/src/symbol.rs
@@ -2353,7 +2353,7 @@ impl Ident {
     #[inline]
     /// Constructs a new identifier from a symbol and a span.
     pub fn new(name: Symbol, span: Span) -> Ident {
-        assert_ne!(name, kw::Empty);
+        debug_assert_ne!(name, kw::Empty);
         Ident { name, span }
     }