From: Shotaro Yamada <sinkuu@sinkuu.xyz>
Date: Wed, 21 Mar 2018 14:58:23 +0000 (+0900)
Subject: Omit unnecessary UTF-8 decoding
X-Git-Url: https://git.lizzy.rs/?a=commitdiff_plain;h=83c8d23cc27fa3ce1597edb78d5ae6f3c99fc4bb;p=rust.git

Omit unnecessary UTF-8 decoding
---

diff --git a/src/utils.rs b/src/utils.rs
index f6d2ff23c34..ddf6ff755ee 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -251,7 +251,8 @@ pub fn stmt_expr(stmt: &ast::Stmt) -> Option<&ast::Expr> {
 
 #[inline]
 pub fn count_newlines(input: &str) -> usize {
-    input.chars().filter(|&c| c == '\n').count()
+    // Using `as_bytes` to omit UTF-8 decoding
+    input.as_bytes().iter().filter(|&&c| c == b'\n').count()
 }
 
 macro_rules! msg {