{"ast_node_type":"variable","tokens":[{"end":69,"kind":"keyword","start":0,"text":"let"}]}
    let trait_ = impl_syntax.value.trait_().and_then(|it| match &it {
        expr_collector.lower_type_ref_opt_disallow_impl_trait(impl_syntax.value.self_ty());
        ast::Type::PathType(path_type) => {