// Test case for Issue 1738:
// https://github.com/typetools/checker-framework/issues/1738

import java.util.Iterator;

@SuppressWarnings("all") // Only check for crashes
public class Issue1738 {
  static class TwoParamIterator<T, R> implements Iterator<T> {
    @Override
    public boolean hasNext() {
      return false;
    }

    @Override
    public T next() {
      return null;
    }
  }

  static class TwoParamCollection<T, R> implements Iterable<T> {
    @Override
    public TwoParamIterator<T, R> iterator() {
      return new TwoParamIterator<T, R>();
    }
  }

  static void test() {
    TwoParamCollection<String, String> c = new TwoParamCollection<>();
    for (String s : c) {
      s.hashCode();
    }
  }
}