{"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"let"}]}
        let impl_trait_id = db.lookup_intern_impl_trait_id(opaque_ty.into());
    for opaque_ty in visitor.0 {
        if matches!(impl_trait_id, ImplTraitId::ReturnTypeImplTrait(..)) {