From 5e474231dad9162fb2e25dd32cc06c1893570cdf Mon Sep 17 00:00:00 2001
From: greg <greg.shuflin@protonmail.com>
Date: Sat, 21 Jan 2017 14:34:17 -0800
Subject: [PATCH] ProgrammingLanguage types need Debug

---
 src/language.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/language.rs b/src/language.rs
index db758d4..649ad07 100644
--- a/src/language.rs
+++ b/src/language.rs
@@ -1,3 +1,4 @@
+use std::fmt::Debug;
 
 pub struct TokenError {
     pub msg: String,
@@ -8,8 +9,8 @@ pub struct ParseError {
 }
 
 pub trait ProgrammingLanguage {
-    type Token;
-    type AST;
+    type Token: Debug;
+    type AST: Debug;
 
     fn tokenize(input: &str) -> Result<Vec<Self::Token>, TokenError>;
     fn parse(input: Vec<Self::Token>) -> Result<Self::AST, ParseError>;