anchor.diff:      type WidgetEvents =
       | Created of WidgetCreatedEvent
   
  +    type WidgetCounterEvents =
  +    | Counted of WidgetCreatedEvent
  +
       let stateBuilder = StateBuilder.Empty ()
   
       let widgetHandlers = 
  
positive.code:                yield addWidget
                       |> simpleHandler stateBuilder
                       |> buildCmd
              }
  
      let handlers =
  
negative.code: module AggregateIntegrationTests = 
      type AggregateType =
      | Widget
      | WidgetCounter
  
      type WidgetId = 
          {
  