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
