error[E0046]: not all trait items implemented, missing: `__jacquard_handler_marker`
 --> tests/regression/ui/missing_effect_handler.rs:5:1
  |
5 | impl TimeEffects for BadHandler {
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `__jacquard_handler_marker` in implementation
  |
  = help: implement the missing item: `fn __jacquard_handler_marker(&self) -> HandlerToken<Self, (dyn TimeEffects + 'static)> { todo!() }`
