{"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"let"}]}
                    let ty = tcx.type_of(item.def_id).instantiate_identity();
                if item.defaultness(tcx).has_value() {
                    let ty = wfcx.deeply_normalize(span, Some(WellFormedLoc::Ty(item_id)), ty);