Implement Display for Type and SExpr.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/lib/sexpr.rs b/src/lib/sexpr.rs
index a6fbe49..6956b9b 100644
--- a/src/lib/sexpr.rs
+++ b/src/lib/sexpr.rs
@@ -1,3 +1,5 @@
+use std::fmt;
+
 use super::types::Type;
 
 #[derive(PartialEq, Debug)]
@@ -6,6 +8,15 @@ pub enum SExpr {
     Sexpr(Vec<SExpr>)
 }
 
+impl fmt::Display for SExpr {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            SExpr::Atom(ref t) => write!(f, "{}", t),
+            SExpr::Sexpr(ref s) => write!(f, "{:?}", s)
+        }
+    }
+}
+
 #[test]
 fn construct() {
     let atom1 = SExpr::Atom(Type::Number(Number::Int(1)));