fix: builtins impl

src/vm/env.rs

@@ -44,8 +44,8 @@ impl<'jit, 'vm> Env<'jit, 'vm> {
                 .map(|(&k, v)| {
                     (
                         k,
-                        if let Value::Builtins = v {
-                            Value::AttrSet(new.clone())
+                        if let Value::Builtins(weak) = v {
+                            Value::AttrSet(weak.upgrade().unwrap())
                         } else {
                             v.clone()
                         },