Cannot use event as trigger (Dezyne Reference Manual)

11.4.2 Cannot use event as trigger

In an interface this indicates an out-event is used as a trigger.

interface interface_action_used_as_trigger
{
  out void world ();
  behavior
  {
    on world: {}
  }
}

This results in the following error message:

interface-action-used-as-trigger.dzn:6:8: error: cannot use out-event
    `world' as trigger
interface-action-used-as-trigger.dzn:3:3: info: event `world' defined
    here

in a component this indicates that either it is an out-vent of a provides interface, or an in-event of a requires interface that is used as a trigger.

interface ihello
{
  in void hello ();
  out void world ();
  behavior {on hello:world;}
}

component component_action_used_as_trigger
{
  provides ihello p;
  requires ihello r;
  behavior
  {
    on p.world (): {}
    on r.hello (): {}
  }
}

This results in the following error messages:

component-action-used-as-trigger.dzn:14:8: error: cannot use provides
    out-event `world' as trigger
component-action-used-as-trigger.dzn:10:3: info: port `p' defined here
component-action-used-as-trigger.dzn:4:3: info: event `world' defined
    here
component-action-used-as-trigger.dzn:15:8: error: cannot use requires
    in-event `hello' as trigger
component-action-used-as-trigger.dzn:11:3: info: port `r' defined here
component-action-used-as-trigger.dzn:3:3: info: event `hello' defined
    here