{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"mir::AggregateKind::Adt(_,"}]}
            mir::AggregateKind::Adt(_, variant_index, _, _, active_field_index) => {
        let (variant_index, variant_dest, active_field_index) = match *kind {
                let variant_dest = self.project_downcast(dest, variant_index)?;