framework/tests/all-systems/java8inference/Issue1424.java

// Test case for Issue 1424.
// https://github.com/typetools/checker-framework/issues/1424

@SuppressWarnings("unchecked")
abstract class Issue1424 {
  class Box<T> {}

  interface Callable<V> {
    V call() throws Exception;
  }

  class MyCallable<T> implements Callable<T> {
    MyCallable(Callable<T> delegate) {}

    public T call() throws Exception {
      throw new RuntimeException();
    }
  }

  abstract <T> Box<T> submit(Callable<T> t);

  Box<Boolean> foo() {
    return submit(new MyCallable(() -> true));
  }
}