{"ast_node_type":"variable","tokens":[{"end":47,"kind":"keyword","start":0,"text":"let"}]}
        let trait_def_id = self.parent(def_id);
        debug_assert_matches!(self.def_kind(def_id), DefKind::AssocTy | DefKind::AssocConst);
        debug_assert_matches!(self.def_kind(trait_def_id), DefKind::Trait);