From 5e1229366d8298674753e004a8ab2ee4ca300971 Mon Sep 17 00:00:00 2001
From: Robert Habermeier <rphmeier@gmail.com>
Date: Fri, 20 May 2016 15:27:20 -0400
Subject: [PATCH] add Display impl for Mismatch

---
 util/src/error.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/util/src/error.rs b/util/src/error.rs
index 9e76e885d..74de40734 100644
--- a/util/src/error.rs
+++ b/util/src/error.rs
@@ -66,6 +66,12 @@ pub struct Mismatch<T: fmt::Debug> {
 	pub found: T,
 }
 
+impl<T: fmt::Debug + fmt::Display> fmt::Display for Mismatch<T> {
+	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+		f.write_fmt(format_args!("Expected {}, found {}", self.expected, self.found))
+	}
+}
+
 #[derive(Debug, PartialEq, Eq)]
 /// Error indicating value found is outside of a valid range.
 pub struct OutOfBounds<T: fmt::Debug> {