import org.checkerframework.checker.nullness.qual.NonNull;
import org.checkerframework.checker.nullness.qual.Nullable;

public class WhileTest {
  @Nullable Integer z;
  @NonNull Integer nnz = Integer.valueOf(22);

  public static void main(String[] args) {
    new WhileTest().testwhile1();
  }

  public void testwhile1() {
    z = null;
    // :: error: (assignment)
    nnz = z;

    while (z == null) {
      break;
    }
    // :: error: (assignment)
    nnz = z;
    nnz.toString();
  }

  public void testwhile2() {
    z = null;
    while (z == null) {}
    nnz = z;
  }

  public void testdo1() {
    z = null;
    do {
      break;
    } while (z == null);
    // :: error: (assignment)
    nnz = z;
  }

  public void testdo2() {
    z = null;
    do {} while (z == null);
    nnz = z;
  }

  public void testfor1() {
    z = null;
    for (; z == null; ) {
      break;
    }
    // :: error: (assignment)
    nnz = z;
  }

  public void testfor2() {
    z = null;
    for (; z == null; ) {}
    nnz = z;
  }
}