{"ast_node_type":"variable","tokens":[{"end":93,"kind":"keyword","start":0,"text":"let"}]}
    let parent_generics = parent_generic_def(db, def).map(|def| Box::new(generics(db, def)));
pub fn generics(db: &dyn DefDatabase, def: GenericDefId) -> Generics {
    let (params, store) = db.generic_params_and_store(def);