code: /*
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.rxjava3.observers;
  
  /**
   * An interface that indicates that the implementing type is composed of individual components and exposes information
   * about their behavior.
   *
   * <p><em>NOTE:</em> This is considered a read-only public API and is not intended to be implemented externally.
   * <p>History: 2.1.4 - experimental
   * @since 2.2
   */
  public interface LambdaConsumerIntrospection {
  
      /**
       * Returns {@code true} or {@code false} if a custom {@code onError} consumer has been provided.
       * @return {@code true} if a custom {@code onError} consumer implementation was supplied. Returns {@code false} if the
       * implementation is missing an error consumer and thus using a throwing default implementation.
       */
      boolean hasCustomOnError();
  
  }
  