fix: thunk & function

src/builtins/mod.rs

@@ -54,10 +54,8 @@ pub fn env<'vm>() -> Rc<Env<'vm>> {
     }
     let builtins = Value::RecAttrSet(RecAttrSet::from_inner(map.clone()));
     let thunk = Thunk {
-        thunk: RefCell::new(_Thunk::Value(Box::new(builtins.clone()))),
-        env: RefCell::default(),
+        thunk: Rc::new(RefCell::new(_Thunk::Value(Box::new(builtins.clone())))),
     };
-    thunk.capture(builtins_env);
     map.insert(Symbol::from("builtins"), Value::Thunk(thunk));
 
     env.insert(Symbol::from("builtins"), builtins);