{"ast_node_type":"variable","tokens":[{"end":60,"kind":"keyword","start":0,"text":"let"}]}
                let fields = &adt.non_enum_variant().fields;
            ty::Adt(adt, args) if self.tcx().is_lang_item(adt.did(), LangItem::MaybeUninit) => {
                let ty = fields[FieldIdx::ONE].ty(self.tcx(), args);