error[E0594]: cannot assign to `identity.stamp`, which is behind a `&` reference
  --> tests/regression/ui/route_identity_mutation_in_maintenance.rs:71:9
   |
67 |           identity: &PublishedRouteRecord,
   |           -------- this is an immutable reference
...
71 | /         identity.stamp = jacquard_traits::jacquard_core::RouteIdentityStamp {
72 | |             route_id: RouteId([0; 16]),
73 | |             topology_epoch: identity.stamp.topology_epoch,
74 | |             materialized_at_tick: identity.stamp.materialized_at_tick,
75 | |             publication_id: identity.stamp.publication_id,
76 | |         };
   | |_________^ `identity` is a `&` reference, so it cannot be written to
