[types] Revert to a more Rusty way to print objects for Debug

types/src/object.rs

@@ -18,6 +18,7 @@ use std::any::Any;
 use std::fmt;
 use super::*;
 
+#[derive(Debug)]
 pub enum Obj {
     Null,
     Ptr(Box<Object>)
@@ -58,12 +59,6 @@ impl fmt::Display for Obj {
     }
 }
 
-impl fmt::Debug for Obj {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{}", self)
-    }
-}
-
 //#[derive(Debug, PartialEq)]
 //pub enum Object {
 //    ByteVector(Vec<u8>),