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11.8.4 call value discarded

A typed function is called without using its return value. 

interface call_discard_value
{
  in void hello ();
  behavior
  {
    bool f ()
    {
      return true;
    }

    on hello: f ();
  }
}

This results in the following error message: 

call-discard-value.dzn:11:15: error: call value discarded