From c30fa92a0aac87ba27df261ece44602f027a1800 Mon Sep 17 00:00:00 2001
From: Andrea Canciani <ranma42@gmail.com>
Date: Wed, 30 Dec 2015 10:08:28 +0100
Subject: [PATCH] `EscapeUnicode` and `EscapeDefault` are `ExactSizeIterator`s

In #28662, `size_hint` was made exact for `EscapeUnicode` and
`EscapeDefault`, but neither was marked as `ExactSizeIterator`.
---
 src/libcore/char.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/libcore/char.rs b/src/libcore/char.rs
index 6a2331dddcf0e..25d90cc6f3a4a 100644
--- a/src/libcore/char.rs
+++ b/src/libcore/char.rs
@@ -483,6 +483,9 @@ impl Iterator for EscapeUnicode {
     }
 }
 
+#[stable(feature = "exact_size_escape", since = "1.11.0")]
+impl ExactSizeIterator for EscapeUnicode { }
+
 /// An iterator that yields the literal escape code of a `char`.
 ///
 /// This `struct` is created by the [`escape_default()`] method on [`char`]. See
@@ -578,6 +581,9 @@ impl Iterator for EscapeDefault {
     }
 }
 
+#[stable(feature = "exact_size_escape", since = "1.11.0")]
+impl ExactSizeIterator for EscapeDefault { }
+
 /// An iterator over `u8` entries represending the UTF-8 encoding of a `char`
 /// value.
 ///