checker/tests/nullness/MissingBoundAnnotations.java

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import org.checkerframework.checker.nullness.qual.*;

public final class MissingBoundAnnotations {

  public static <K extends Comparable<? super K>, V> Collection<@KeyFor("#1") K> sortedKeySet(
      Map<K, V> m) {
    ArrayList<@KeyFor("m") K> theKeys = new ArrayList<>(m.keySet());
    Collections.sort(theKeys);
    return theKeys;
  }

  public static <K extends Comparable<? super K>, V>
      Collection<@KeyFor("#1") K> sortedKeySetSimpler(ArrayList<@KeyFor("#1") K> theKeys) {
    Collections.sort(theKeys);
    return theKeys;
  }
}