} else if reqs.Thread == event.MustNotHave && ctx.M != NoThread {
		return fmt.Errorf("expected no thread but had one")
	}

	// Check proc requirements.
	if reqs.Proc == event.MustHave && ctx.P == NoProc {
		return fmt.Errorf("expected a proc but didn't have one")
	} else if reqs.Proc == event.MustNotHave && ctx.P != NoProc {
		return fmt.Errorf("expected no proc but had one")
	}