{"ast_node_type":"variable","tokens":[{"end":69,"kind":"keyword","start":0,"text":"let"}]}
    let params = generic_def.params(sema.db).into_iter().filter(|p| {
    let start_with_lifetime = matches!(args.peek()?, ast::GenericArg::LifetimeArg(_));
        if let hir::GenericParam::TypeParam(it) = p {