diff --git a/engine/src/core/repl/zlua.rs b/engine/src/core/repl/zlua.rs
index c5c483b..90203c5 100644
--- a/engine/src/core/repl/zlua.rs
+++ b/engine/src/core/repl/zlua.rs
@@ -23,12 +23,12 @@ impl Command for ZLua {
         globals.set("add", add)?;
 
         let is_equal = lua.create_function(|_, (list1, list2): (i32, i32)| {
-            // This function just checks whether two string lists are equal, and in an inefficient way.
-            // Lua callbacks return `mlua::Result`, an Ok value is a normal return, and an Err return
-            // turns into a Lua 'error'. Again, any type that is convertible to Lua may be returned.
+            if list1 == 0 || list2 == 0 {
+                return Err(mlua::Error::RuntimeError("Zero values not allowed".to_string()));
+            }
             Ok(list1 == list2)
         })?;
-        globals.set("is_equal", is_equal)?;
+        globals.set("isEqual", is_equal)?;
 
         let log = lua.create_function(|_, (msg,): (String,)| {
         println!("{}", msg);
@@ -36,7 +36,11 @@ impl Command for ZLua {
         })?;
         globals.set("log", log)?;
 
-        
+        let fail_safe = lua.create_function(|_,()|{
+            println!("Failed");
+            Ok(())
+        })?;
+        globals.set("failSafe",fail_safe)?;
         let mut editor = DefaultEditor::new().expect("Failed to create editor");
 
         loop {
@@ -55,6 +59,15 @@ impl Command for ZLua {
 
                 match lua.load(&line).eval::<MultiValue>() {
                     Ok(values) => {
+                        for value in &values {
+                            match value {
+                                mlua::Value::Nil => println!("Got nil value"),
+                                mlua::Value::Number(n) => println!("Got number: {}", n),
+                                mlua::Value::String(s) => println!("Got string: {}", s.to_str()?),
+                                mlua::Value::Boolean(b) => println!("Got boolean: {}", b),
+                                _ => eprintln!("Got unexpected type: {:#?}", value)
+                            }
+                        }
                         editor.add_history_entry(line).unwrap();
                         println!(
                             "{}",
@@ -76,9 +89,11 @@ impl Command for ZLua {
                     }
 
                     Err(e) => {
-                        eprintln!("error: {}", e);
+                        eprintln!("Error: {} at line {}", e, line.lines().count());
+                        eprintln!("Input that caused error: {}", line);
                         break;
                     }
+        
                 }
             }
         }