{"ast_node_type":"variable","tokens":[{"end":98,"kind":"keyword","start":0,"text":"let"}]}
            let result = ty.clone().try_fold_with(filler, DebruijnIndex::INNERMOST).unwrap_or(ty);
            let filler = &mut Filler { db: ctx.db, generics: ctx.generics() };
            make_binders(ctx.db, filler.generics, result)