{"ast_node_type":"variable","tokens":[{"end":42,"kind":"keyword","start":0,"text":"let"}]}
        let is_npo = |def: AdtDef<'tcx>| {
        // For that we first unpeel transparent *structs* (but not unions).
            self.tcx.has_attr(def.did(), sym::rustc_nonnull_optimization_guaranteed)