{"ast_node_type":"function","tokens":[{"end":53,"kind":"keyword","start":0,"text":"fn"}]}
    fn generics_of(&self, def_id: DefId) -> Generics;
    fn trait_impl(&self, trait_impl: &ImplDef) -> ImplTrait;
    fn predicates_of(&self, def_id: DefId) -> GenericPredicates;