From cf9b6e9e07339f8180d63a869adee7cd0cface51 Mon Sep 17 00:00:00 2001
From: Robert Habermeier <rphmeier@gmail.com>
Date: Fri, 20 May 2016 15:19:26 -0400
Subject: [PATCH] Add Display impl for OutOfBounds

---
 util/src/error.rs | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/util/src/error.rs b/util/src/error.rs
index 409cc0e5d..9e76e885d 100644
--- a/util/src/error.rs
+++ b/util/src/error.rs
@@ -57,7 +57,6 @@ pub enum UtilError {
 	BadSize,
 }
 
-
 #[derive(Debug, PartialEq, Eq)]
 /// Error indicating an expected value was not found.
 pub struct Mismatch<T: fmt::Debug> {
@@ -78,6 +77,27 @@ pub struct OutOfBounds<T: fmt::Debug> {
 	pub found: T,
 }
 
+impl<T: fmt::Debug + fmt::Display> fmt::Display for OutOfBounds<T> {
+	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+		let msg = match (self.min.as_ref(), self.max.as_ref()) {
+			(Some(min), Some(max)) => {
+				format!("Min={}, Max={}", min, max)
+			}
+			(Some(min), _) => {
+				format!("Min={}", min)
+			}
+			(_, Some(max)) => {
+				format!("Max={}", max)
+			}
+			(None, None) => {
+				"".into()
+			}
+		};
+
+		f.write_fmt(format_args!("Value {} out of bounds. {}", self.found, msg))
+	}
+}
+
 impl From<FromHexError> for UtilError {
 	fn from(err: FromHexError) -> UtilError {
 		UtilError::FromHex(err)