From 9561e1bf91ac5e29a43a7c9f98a4f1247cfe7682 Mon Sep 17 00:00:00 2001
From: Eryn Wells <eryn@erynwells.me>
Date: Fri, 23 Dec 2016 17:45:37 -0700
Subject: [PATCH] Add Display trait to Token and Kind

---
 src/lexer.rs | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/lexer.rs b/src/lexer.rs
index 6f45041..984c62d 100644
--- a/src/lexer.rs
+++ b/src/lexer.rs
@@ -1,5 +1,7 @@
 //! # Lexer
 
+use std::fmt;
+
 use characters;
 use characters::RelativeIndexable;
 
@@ -9,11 +11,28 @@ pub enum Kind {
     Identifier,
 }
 
+impl fmt::Display for Kind {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let s = match *self {
+            Kind::LeftParen => "LeftParen",
+            Kind::RightParen => "RightParen",
+            Kind::Identifier => "Identifier",
+        };
+        write!(f, "{}", s)
+    }
+}
+
 pub struct Token {
     kind: Kind,
     value: String,
 }
 
+impl fmt::Display for Token {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "({}, \"{}\")", self.kind, self.value)
+    }
+}
+
 enum State {
     Initial,
     Identifier,