feat: get rid of gc and cyclic thunk

src/ty/internal/attrset.rs

@@ -2,7 +2,6 @@ use std::ops::Deref;
 use std::rc::Rc;
 
 use derive_more::Constructor;
-use gc_arena::Collect;
 use hashbrown::{HashMap, HashSet};
 use itertools::Itertools;
 
@@ -17,12 +16,6 @@ pub struct AttrSet<'gc> {
     data: HashMap<usize, Value<'gc>>,
 }
 
-unsafe impl<'gc> Collect<'gc> for AttrSet<'gc> {
-    fn trace<T: gc_arena::collect::Trace<'gc>>(&self, cc: &mut T) {
-        self.data.trace(cc);
-    }
-}
-
 impl<'gc> From<HashMap<usize, Value<'gc>>> for AttrSet<'gc> {
     fn from(data: HashMap<usize, Value<'gc>>) -> Self {
         Self { data }