From 4da0da9281632890cb833201eb940519b388cf25 Mon Sep 17 00:00:00 2001
From: Lzu Tao <taolzu@gmail.com>
Date: Tue, 19 Nov 2019 23:08:50 +0700
Subject: [PATCH] use more efficient code to generate repeated string

see https://rust.godbolt.org/z/z9vrFP for comparison
---
 clippy_lints/src/strings.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/clippy_lints/src/strings.rs b/clippy_lints/src/strings.rs
index fca70fe8dbde..b10991025232 100644
--- a/clippy_lints/src/strings.rs
+++ b/clippy_lints/src/strings.rs
@@ -154,7 +154,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for StringLitAsBytes {
                     if let LitKind::Str(ref lit_content, style) = lit.node {
                         let callsite = snippet(cx, args[0].span.source_callsite(), r#""foo""#);
                         let expanded = if let StrStyle::Raw(n) = style {
-                            let term = (0..n).map(|_| '#').collect::<String>();
+                            let term = "#".repeat(n as usize);
                             format!("r{0}\"{1}\"{0}", term, lit_content.as_str())
                         } else {
                             format!("\"{}\"", lit_content.as_str())