Class OnFailure

future-java/src/main/java/io/trane/future/Promise.java:663–674

  }

  private static class OnFailure<T> extends Continuation<T, T> {
    private final Consumer<Throwable> c;

    public OnFailure(final Consumer<Throwable> c) {
      this.c = c;
    }

    @Override
    final Future<T> apply(final Future<T> result) {
      return result.onFailure(c);
    }
  }

  @Override
  public final Future<T> onFailure(final Consumer<Throwable> c) {