// Test case for Issue 1555
// https://github.com/typetools/checker-framework/issues/1555

import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
import org.checkerframework.checker.nullness.util.NullnessUtil;

public class Issue1555 {

  private @MonotonicNonNull String x;

  String test() {
    return NullnessUtil.castNonNull(x);
  }
}