fix: thunk & function

src/vm/env.rs

@@ -26,11 +26,6 @@ impl Clone for Env<'_> {
     }
 }
 
-#[derive(Debug, Clone)]
-pub struct CapturedEnv<'vm> {
-    env: Rc<Env<'vm>>,
-}
-
 impl<'vm> Env<'vm> {
     pub fn empty() -> Self {
         Env::default()
@@ -78,18 +73,4 @@ impl<'vm> Env<'vm> {
         let map = last.map.borrow().clone();
         *self.map.borrow_mut() = map;
     }
-
-    pub fn captured(self: Rc<Self>) -> CapturedEnv<'vm> {
-        CapturedEnv { env: self }
-    }
-}
-
-impl<'vm> CapturedEnv<'vm> {
-    pub fn lookup(&self, symbol: &Symbol) -> Option<Value<'vm>> {
-        self.env.lookup(symbol)
-    }
-
-    pub fn released(self) -> Rc<Env<'vm>> {
-        Rc::new(self.env.as_ref().clone())
-    }
 }