Implement PartialEq and PartialOrd resolves #7

src/interpreter.rs

@@ -61,6 +61,8 @@ fn interpret_define(args: &Vec<Datum>, env: &mut Env) -> Datum {
                     panic!("INTERPRET-DEFINE -- parameter not a symbol {:?}", p);
                 }
             }
+            // FIXME: we need to keep the current environment here otherwise closures will not work
+            // FIXME: also create a dedicated enum-type for procedures instead of putting it into a vector
             let lambda_parameters = Datum::List(parameters);
             let lambda_body = Datum::List(args[2..].to_vec());
             let lambda = Datum::List(vec![make_symbol("lambda"), lambda_parameters, lambda_body]);