@SuppressWarnings("unchecked")
  private static <IN, OUT> Execution<IN, OUT, List<OUT>> onRegion(Region<?, ?> region) {
    return (Execution<IN, OUT, List<OUT>>) FunctionService.onRegion(region);
  }
Acceptance tests for function executions timer for functions with hasResult=false
geode-assembly/src/acceptanceTest/java/org/apache/geode/metrics/function/executions/FunctionExecutionsTimerNoResultTest.java