{"ast_node_type":"variable","tokens":[{"end":88,"kind":"keyword","start":0,"text":"let"}]}
        let insert_after = ted::Position::after(builder.make_mut(adt.clone()).syntax());
    acc.add(AssistId::refactor("replace_derive_with_manual_impl"), label, target, |builder| {
        let impl_is_unsafe = trait_.map(|s| s.is_unsafe(ctx.db())).unwrap_or(false);