// @skip-test

// Test case for issue #520: https://github.com/typetools/checker-framework/issues/520

// compile with: $CHECKERFRAMEWORK/checker/bin/javac -g Issue520.java -processor nullness
// -AprintAllQualifiers

import java.util.ArrayList;
import java.util.List;
import org.checkerframework.checker.nullness.qual.*;

public class Issue520 {}

abstract class Parent<T> {
  protected final List<? super @KeyForBottom T> list;

  public Parent(List<? super @KeyForBottom T> list) {
    this.list = list;
  }
}

abstract class Child extends Parent<CharSequence> {
  public Child(List<? super CharSequence> list) {
    super(list);
  }

  public void add(CharSequence seq) {
    list.add(seq);
  }
}

class WildCardAdd {
  List<@UnknownKeyFor ? super @KeyForBottom CharSequence> wildCardList =
      new ArrayList<@KeyForBottom CharSequence>();

  void foo(
      List<@KeyFor("m") CharSequence> keyForMCharSeq, @UnknownKeyFor CharSequence unknownCharSeq) {
    wildCardList = keyForMCharSeq;
    wildCardList.add(unknownCharSeq);
    @KeyFor("y") Object o = wildCardList.get(0);
  }
}