From 6050229e7edd1688be78494f8cee1dc551e064de Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Tue, 17 Apr 2018 00:10:17 -0700
Subject: [PATCH] Simplify counting remaining elements

---
 serde/src/de/value.rs | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/serde/src/de/value.rs b/serde/src/de/value.rs
index e477c216..8d305b79 100644
--- a/serde/src/de/value.rs
+++ b/serde/src/de/value.rs
@@ -652,11 +652,8 @@ where
 {
     /// Check for remaining elements after passing a `SeqDeserializer` to
     /// `Visitor::visit_seq`.
-    pub fn end(mut self) -> Result<(), E> {
-        let mut remaining = 0;
-        while self.iter.next().is_some() {
-            remaining += 1;
-        }
+    pub fn end(self) -> Result<(), E> {
+        let remaining = self.iter.count();
         if remaining == 0 {
             Ok(())
         } else {
@@ -849,11 +846,8 @@ where
 {
     /// Check for remaining elements after passing a `MapDeserializer` to
     /// `Visitor::visit_map`.
-    pub fn end(mut self) -> Result<(), E> {
-        let mut remaining = 0;
-        while self.iter.next().is_some() {
-            remaining += 1;
-        }
+    pub fn end(self) -> Result<(), E> {
+        let remaining = self.iter.count();
         if remaining == 0 {
             Ok(())
         } else {