From 0f78c5e4471d2fa2dcae47421404c859b0cbf398 Mon Sep 17 00:00:00 2001
From: Sean McArthur <sean@seanmonstar.com>
Date: Thu, 30 May 2019 12:12:46 -0700
Subject: [PATCH] implement FusedIterator for all HeaderMap iterators

Increases minium Rust version to 1.26, when FusedIterator was
stabilized.
---
 .travis.yml       |  2 +-
 src/header/map.rs | 21 ++++++++++++++++++++-
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 053ba1f5..0a037eeb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,7 +14,7 @@ matrix:
         - rustup target add wasm32-unknown-unknown
         - cargo build --target=wasm32-unknown-unknown
     # minimum rustc version
-    - rust: 1.20.0
+    - rust: 1.26.0
       script: cargo build
 
 script:
diff --git a/src/header/map.rs b/src/header/map.rs
index 66f987cc..8f937499 100644
--- a/src/header/map.rs
+++ b/src/header/map.rs
@@ -4,7 +4,7 @@ use super::name::{HeaderName, HdrName, InvalidHeaderName};
 use std::{fmt, mem, ops, ptr, vec};
 use std::collections::hash_map::RandomState;
 use std::hash::{BuildHasher, Hasher, Hash};
-use std::iter::FromIterator;
+use std::iter::{FromIterator, FusedIterator};
 use std::marker::PhantomData;
 
 pub use self::as_header_name::AsHeaderName;
@@ -1949,6 +1949,8 @@ impl<'a, T> Iterator for Iter<'a, T> {
     }
 }
 
+impl<'a, T> FusedIterator for Iter<'a, T> {}
+
 unsafe impl<'a, T: Sync> Sync for Iter<'a, T> {}
 unsafe impl<'a, T: Sync> Send for Iter<'a, T> {}
 
@@ -2010,6 +2012,8 @@ impl<'a, T> Iterator for IterMut<'a, T> {
     }
 }
 
+impl<'a, T> FusedIterator for IterMut<'a, T> {}
+
 unsafe impl<'a, T: Sync> Sync for IterMut<'a, T> {}
 unsafe impl<'a, T: Send> Send for IterMut<'a, T> {}
 
@@ -2028,6 +2032,7 @@ impl<'a, T> Iterator for Keys<'a, T> {
 }
 
 impl<'a, T> ExactSizeIterator for Keys<'a, T> {}
+impl<'a, T> FusedIterator for Keys<'a, T> {}
 
 // ===== impl Values ====
 
@@ -2043,6 +2048,8 @@ impl<'a, T> Iterator for Values<'a, T> {
     }
 }
 
+impl<'a, T> FusedIterator for Values<'a, T> {}
+
 // ===== impl ValuesMut ====
 
 impl<'a, T> Iterator for ValuesMut<'a, T> {
@@ -2057,6 +2064,8 @@ impl<'a, T> Iterator for ValuesMut<'a, T> {
     }
 }
 
+impl<'a, T> FusedIterator for ValuesMut<'a, T> {}
+
 // ===== impl Drain =====
 
 impl<'a, T> Iterator for Drain<'a, T> {
@@ -2100,6 +2109,8 @@ impl<'a, T> Iterator for Drain<'a, T> {
     }
 }
 
+impl<'a, T> FusedIterator for Drain<'a, T> {}
+
 impl<'a, T> Drop for Drain<'a, T> {
     fn drop(&mut self) {
         unsafe {
@@ -2460,6 +2471,8 @@ impl<'a, T: 'a> DoubleEndedIterator for ValueIter<'a, T> {
     }
 }
 
+impl<'a, T> FusedIterator for ValueIter<'a, T> {}
+
 // ===== impl ValueIterMut =====
 
 impl<'a, T: 'a> Iterator for ValueIterMut<'a, T> {
@@ -2539,6 +2552,8 @@ impl<'a, T: 'a> DoubleEndedIterator for ValueIterMut<'a, T> {
     }
 }
 
+impl<'a, T> FusedIterator for ValueIterMut<'a, T> {}
+
 unsafe impl<'a, T: Sync> Sync for ValueIterMut<'a, T> {}
 unsafe impl<'a, T: Send> Send for ValueIterMut<'a, T> {}
 
@@ -2579,6 +2594,8 @@ impl<T> Iterator for IntoIter<T> {
     }
 }
 
+impl<T> FusedIterator for IntoIter<T> {}
+
 impl<T> Drop for IntoIter<T> {
     fn drop(&mut self) {
         // Ensure the iterator is consumed
@@ -2946,6 +2963,8 @@ impl<'a, T> Iterator for ValueDrain<'a, T> {
     }
 }
 
+impl<'a, T> FusedIterator for ValueDrain<'a, T> {}
+
 impl<'a, T> Drop for ValueDrain<'a, T> {
     fn drop(&mut self) {
         while let Some(_) = self.next() {