From 10cf7bb328345373b1fe59e4d323bef65d06765a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian@centricular.com>
Date: Sun, 3 Jun 2018 17:38:49 +0300
Subject: [PATCH] Implement TrustedLen for Windows and the 4 Chunks iterators

---
 src/libcore/slice/mod.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/libcore/slice/mod.rs b/src/libcore/slice/mod.rs
index 29f86a88fc2d..1dec7c3020d0 100644
--- a/src/libcore/slice/mod.rs
+++ b/src/libcore/slice/mod.rs
@@ -3362,6 +3362,9 @@ impl<'a, T> DoubleEndedIterator for Windows<'a, T> {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<'a, T> ExactSizeIterator for Windows<'a, T> {}
 
+#[unstable(feature = "trusted_len", issue = "37572")]
+unsafe impl<'a, T> TrustedLen for Windows<'a, T> {}
+
 #[stable(feature = "fused", since = "1.26.0")]
 impl<'a, T> FusedIterator for Windows<'a, T> {}
 
@@ -3481,6 +3484,9 @@ impl<'a, T> DoubleEndedIterator for Chunks<'a, T> {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<'a, T> ExactSizeIterator for Chunks<'a, T> {}
 
+#[unstable(feature = "trusted_len", issue = "37572")]
+unsafe impl<'a, T> TrustedLen for Chunks<'a, T> {}
+
 #[stable(feature = "fused", since = "1.26.0")]
 impl<'a, T> FusedIterator for Chunks<'a, T> {}
 
@@ -3597,6 +3603,9 @@ impl<'a, T> DoubleEndedIterator for ChunksMut<'a, T> {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<'a, T> ExactSizeIterator for ChunksMut<'a, T> {}
 
+#[unstable(feature = "trusted_len", issue = "37572")]
+unsafe impl<'a, T> TrustedLen for ChunksMut<'a, T> {}
+
 #[stable(feature = "fused", since = "1.26.0")]
 impl<'a, T> FusedIterator for ChunksMut<'a, T> {}
 
@@ -3707,6 +3716,9 @@ impl<'a, T> ExactSizeIterator for ExactChunks<'a, T> {
     }
 }
 
+#[unstable(feature = "trusted_len", issue = "37572")]
+unsafe impl<'a, T> TrustedLen for ExactChunks<'a, T> {}
+
 #[unstable(feature = "exact_chunks", issue = "47115")]
 impl<'a, T> FusedIterator for ExactChunks<'a, T> {}
 
@@ -3804,6 +3816,9 @@ impl<'a, T> ExactSizeIterator for ExactChunksMut<'a, T> {
     }
 }
 
+#[unstable(feature = "trusted_len", issue = "37572")]
+unsafe impl<'a, T> TrustedLen for ExactChunksMut<'a, T> {}
+
 #[unstable(feature = "exact_chunks", issue = "47115")]
 impl<'a, T> FusedIterator for ExactChunksMut<'a, T> {}