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11.11.1 Type mismatch: parameter expected extern

All event parameters specified in an event definition must be data parameters; in other words, they must have a data type. An example: 

extern int $int$;
interface event_with_bool_porameter
{
  in void hello (bool b);
  behavior {on hello:{}}
}

This results in the following error message: 

event-with-bool-parameter.dzn:4:18: error: type mismatch: parameter `b';
    expected extern, found: `bool'