diff --git a/src/language.rs b/src/language.rs
index d876d86..c277a84 100644
--- a/src/language.rs
+++ b/src/language.rs
@@ -94,3 +94,25 @@ impl<PL, T, A, E> LanguageInterface for (PL, PL::Evaluator) where PL: Programmin
         output
     }
 }
+
+/* below here is new versions of everything */
+
+#[derive(Debug, PartialEq)]
+pub struct EvalStage {
+  index: u8,
+  name: String,
+}
+
+pub struct EvalOptions {
+  debug_stages: Vec<EvalStage>,
+}
+
+pub trait ProgrammingLanguageInterface {
+  fn evaluate_in_repl(&mut self, input: &str, eval_options: EvalOptions);
+  fn get_language_name(&self) -> String;
+  fn get_stages(&self) -> Vec<u8>;
+}
+
+pub trait CompileableLanguage : ProgrammingLanguageInterface {
+  fn compile(&mut self);
+}