feat(env): Rc

src/ty/internal/mod.rs

@@ -466,7 +466,7 @@ pub struct Thunk<'vm> {
 
 #[derive(Debug, IsVariant, Unwrap, Clone)]
 pub enum _Thunk<'vm> {
-    Code(&'vm OpCodes, OnceCell<Rc<Env<'vm>>>),
+    Code(&'vm OpCodes, OnceCell<Env<'vm>>),
     SuspendedFrom(*const Thunk<'vm>),
     Value(Value<'vm>),
 }
@@ -478,7 +478,7 @@ impl<'vm> Thunk<'vm> {
         }
     }
 
-    pub fn capture(&self, env: Rc<Env<'vm>>) {
+    pub fn capture(&self, env: Env<'vm>) {
         if let _Thunk::Code(_, envcell) = &*self.thunk.borrow() {
             envcell.get_or_init(|| env);
         }