From a623ea5301737507a8229c2ddae74b20f727bd1b Mon Sep 17 00:00:00 2001
From: Giles Cope <gilescope@gmail.com>
Date: Tue, 26 Jan 2021 21:51:18 +0000
Subject: [PATCH] Same instructions, but simpler.

---
 library/core/src/str/iter.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/core/src/str/iter.rs b/library/core/src/str/iter.rs
index 0c74f6e45a78..83f484dc570c 100644
--- a/library/core/src/str/iter.rs
+++ b/library/core/src/str/iter.rs
@@ -47,7 +47,7 @@ impl<'a> Iterator for Chars<'a> {
     #[inline]
     fn count(self) -> usize {
         // length in `char` is equal to the number of non-continuation bytes
-        self.iter.map(|&byte| !utf8_is_cont_byte(byte) as usize).sum()
+        self.iter.filter(|&&byte| !utf8_is_cont_byte(byte)).count()
     }
 
     #[inline]