From 7c5fef49f8c0cbae19f6ca32d43e78e7bd35187e Mon Sep 17 00:00:00 2001
From: greg <greg.shuflin@protonmail.com>
Date: Mon, 27 Nov 2017 00:57:26 -0800
Subject: [PATCH] List datatype

---
 src/rukka_lang/mod.rs | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/rukka_lang/mod.rs b/src/rukka_lang/mod.rs
index 6f1dde3..e8e3827 100644
--- a/src/rukka_lang/mod.rs
+++ b/src/rukka_lang/mod.rs
@@ -18,7 +18,19 @@ impl ProgrammingLanguageInterface for Rukka {
 
   fn evaluate_in_repl(&mut self, input: &str, _eval_options: &EvalOptions) -> ReplOutput {
     let mut output = ReplOutput::default();
-    output.add_output(format!("Everything is ()"));
+    output.add_output(eval(input));
     output
   }
 }
+
+fn eval(input: &str) -> String {
+  let a = List { next: None };
+  let b = List { next: Some(&a) };
+
+  format!("Everything is () {:?}", b)
+}
+
+#[derive(Debug)]
+struct List<'a> {
+  next: Option<&'a List<'a>>,
+}