From db718fe75a30685a51bd4d2321a5327ab0c408ac Mon Sep 17 00:00:00 2001
From: KAMADA Ken'ichi <kamada@nanohz.org>
Date: Tue, 11 Jul 2017 23:29:26 +0900
Subject: [PATCH] Derive Hash trait for Tag and Context.

---
 src/tag.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/tag.rs b/src/tag.rs
index 3b0f246..c57f2bb 100644
--- a/src/tag.rs
+++ b/src/tag.rs
@@ -47,7 +47,7 @@ use util::atou16;
 // PartialEq and Eq need to be _automatically derived_ for Tag to
 // emulate structural equivalency.
 // <https://github.com/rust-lang/rfcs/pull/1445>
-#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 pub struct Tag(pub Context, pub u16);
 
 impl Tag {
@@ -94,7 +94,7 @@ impl fmt::Display for Tag {
 }
 
 /// An enum that indicates how a tag number is interpreted.
-#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 pub enum Context {
     /// TIFF attributes defined in the TIFF Rev. 6.0 specification.
     Tiff,	// 0th/1st IFD