feat: lookup at downgrade time

works, but leaks memory

src/ty/internal/attrset.rs

@@ -2,11 +2,10 @@ use std::ops::Deref;
 use std::rc::Rc;
 
 use derive_more::Constructor;
-use gc_arena::{Collect, Gc, Mutation};
+use gc_arena::Collect;
 use hashbrown::{HashMap, HashSet};
 use itertools::Itertools;
 
-use crate::env::VmEnv;
 use crate::vm::VM;
 
 use super::super::public as p;
@@ -58,14 +57,6 @@ impl<'gc> AttrSet<'gc> {
         self.data.get(&sym).is_some()
     }
 
-    pub fn capture(&mut self, env: Gc<'gc, VmEnv<'gc>>, mc: &Mutation<'gc>) {
-        self.data.iter().for_each(|(_, v)| {
-            if let Value::Thunk(ref thunk) = v.clone() {
-                thunk.capture_env(env, mc);
-            }
-        })
-    }
-
     pub fn update(&mut self, other: &AttrSet<'gc>) {
         for (k, v) in other.data.iter() {
             self.push_attr_force(*k, v.clone())