{"ast_node_type":"variable","tokens":[{"end":42,"kind":"keyword","start":0,"text":"let"}]}
    let mut result = AstSubsts::default();
fn get_type_args_from_arg_list(generic_arg_list: ast::GenericArgList) -> Option<AstSubsts> {
    generic_arg_list.generic_args().for_each(|generic_arg| match generic_arg {