From 68ea8ff16f74be00797a237f8fd438b1d097ab5a Mon Sep 17 00:00:00 2001
From: klensy <klensy@users.noreply.github.com>
Date: Wed, 8 Jun 2022 21:23:39 +0300
Subject: drive by fix needless allocation of const string number

---
 compiler/rustc_errors/src/emitter.rs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'compiler/rustc_errors/src')

diff --git a/compiler/rustc_errors/src/emitter.rs b/compiler/rustc_errors/src/emitter.rs
index 06a1a31c672..ec48efa9bce 100644
--- a/compiler/rustc_errors/src/emitter.rs
+++ b/compiler/rustc_errors/src/emitter.rs
@@ -771,8 +771,12 @@ impl EmitterWriter {
         self
     }
 
-    fn maybe_anonymized(&self, line_num: usize) -> String {
-        if self.ui_testing { ANONYMIZED_LINE_NUM.to_string() } else { line_num.to_string() }
+    fn maybe_anonymized(&self, line_num: usize) -> Cow<'static, str> {
+        if self.ui_testing {
+            Cow::Borrowed(ANONYMIZED_LINE_NUM)
+        } else {
+            Cow::Owned(line_num.to_string())
+        }
     }
 
     fn draw_line(
-- 
cgit 1.4.1-3-g733a5