{"ast_node_type":"variable","tokens":[{"end":57,"kind":"keyword","start":0,"text":"let"}]}
        let ty::Adt(_, args) = ty.kind() else { bug!() };
    ) -> impl Iterator<Item = (&'tcx FieldDef, RevealedTy<'tcx>)> {
        variant.fields.iter().map(move |field| {