*
   * @since 20.0
   */
  public static void throwIfUnchecked(Throwable throwable) {
    checkNotNull(throwable);
    if (throwable instanceof RuntimeException) {
      throw (RuntimeException) throwable;
    }
    if (throwable instanceof Error) {
      throw (Error) throwable;
    }
  }

  /**
   * Propagates {@code throwable} exactly as-is, if and only if it is an instance of {@link

   *
   * @since 20.0
   */
  public static void throwIfUnchecked(Throwable throwable) {
    checkNotNull(throwable);
    if (throwable instanceof RuntimeException) {
      throw (RuntimeException) throwable;
    }
    if (throwable instanceof Error) {
      throw (Error) throwable;
    }
  }

  /**
   * Propagates {@code throwable} exactly as-is, if and only if it is an instance of {@link

    closer.register(null);
    closer.close();
  }

  static Throwable[] getSuppressed(Throwable throwable) {
    try {
      Method getSuppressed = Throwable.class.getDeclaredMethod("getSuppressed");
      return (Throwable[]) getSuppressed.invoke(throwable);
    } catch (Exception e) {
      throw new AssertionError(e); // only called if running on JDK7
    }
  }

  /**

    Throwable throwable = thrown;

    // close closeables in LIFO order
    while (!stack.isEmpty()) {
      Closeable closeable = stack.removeFirst();
      try {
        closeable.close();
      } catch (Throwable e) {
        if (throwable == null) {
          throwable = e;
        } else {
          suppressor.suppress(closeable, throwable, e);
        }
      }
    }

    closer.register(null);
    closer.close();
  }

  static Throwable[] getSuppressed(Throwable throwable) {
    try {
      Method getSuppressed = Throwable.class.getDeclaredMethod("getSuppressed");
      return (Throwable[]) getSuppressed.invoke(throwable);
    } catch (Exception e) {
      throw new AssertionError(e); // only called if running on JDK7
    }
  }

  /**

        log.fatal(message.toString());
    }

    /**
     * ログを出力します。
     *
     * @param throwable
     *            例外。{@literal null}であってはいけません
     */
    public void log(final Throwable throwable) {
        assertArgumentNotNull("throwable", throwable);

        error(throwable.getMessage(), throwable);
    }

    /**
     * ログを出力します。
     *
     * @param messageCode

debug(CharSequence); public abstract void debug(CharSequence, Throwable); public abstract void debug(Throwable); public abstract boolean isInfoEnabled(); public abstract void info(CharSequence); public abstract void info(CharSequence, Throwable); public abstract void info(Throwable); public abstract boolean isWarnEnabled(); public abstract void warn(CharSequence); public abstract void warn(CharSequence, Throwable); public abstract void warn(Throwable); public abstract boolean isErrorEnabled(); public abstract...

    protected abstract void realRun() throws Throwable;

    public final void run() {
      try {
        realRun();
      } catch (Throwable t) {
        threadUnexpectedException(t);
      }
    }
  }

  public abstract class RunnableShouldThrow implements Runnable {
    protected abstract void realRun() throws Throwable;

    final Class<?> exceptionClass;

    protected abstract void realRun() throws Throwable;

    @Override
    public final void run() {
      try {
        realRun();
      } catch (Throwable t) {
        threadUnexpectedException(t);
      }
    }
  }

  public abstract class RunnableShouldThrow implements Runnable {
    protected abstract void realRun() throws Throwable;

    final Class<?> exceptionClass;

      connectSocket()
      success = true
      return ConnectResult(plan = this)
    } catch (e: IOException) {
      user.connectFailed(route, null, e)
      return ConnectResult(plan = this, throwable = e)
    } finally {
      user.removePlanToCancel(this)
      if (!success) {
        rawSocket?.closeQuietly()
      }
    }
  }

  override fun connectTlsEtc(): ConnectResult {