* provide a non-nullable {@code cause}, as many users expect to find one.
   */
  public UncheckedExecutionException(@CheckForNull Throwable cause) {
    super(cause);
  }

  private static final long serialVersionUID = 0;

    setMap(map);
    Serialization.populateMultimap(this, stream, distinctKeys);
  }

  @GwtIncompatible // Not needed in emulated source.
  @J2ktIncompatible
  private static final long serialVersionUID = 0;