import javax.validation.constraints.NotNull;
import org.checkerframework.checker.nullness.qual.*;

// @skip-test The clean-room implementation of javax.validation.constraints.NotNull is not in this
// repository because Oracle claims a license over its specification and is lawsuit-happy.

public class Issue308 {
  @NonNull Object nonnull = new Object();
  @Nullable Object nullable;

  @NotNull(message = "hi") Object notnull1 = new Object();

  @NotNull(groups = {Object.class}) Object notnull2 = new Object();

  void foo() {
    nonnull = notnull1;
    notnull2 = nonnull;
    notnull1 = notnull2;

    nullable = notnull1;
    nullable = notnull2;
  }
}