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11.11.3 Cannot use inout-parameter on out-event

An out-event must not have an inout-parameter. An example: 

extern int $int$;
interface inout_parameter_on_out_event
{
  out void world (inout int value);
  behavior {on optional:world;}
}

This results in the following error message: 

inout-parameter-on-out-event.dzn:4:19: error: cannot use inout-parameter
    on out-event `world'