{"ast_node_type":"variable","tokens":[{"end":67,"kind":"keyword","start":0,"text":"let"}]}
    let has_trait_self_param = params.trait_self_param().is_some();
    let (params, store) = db.generic_params_and_store(def);
    Generics { def, params, parent_generics, has_trait_self_param, store }