{"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"parent_id.map(|id|"}]}
            parent_id.map(|id| TyBuilder::subst_for_def(db, id, None).fill(&mut filler).build());
        let parent_substs =
        let substs = TyBuilder::subst_for_def(db, self.id, parent_substs).fill(&mut filler).build();