code: static <T> void afterErrorWithFailure(SignalPeek<T> parent,
  			Throwable callbackFailure, Throwable originalError, Context context) {
  		Exceptions.throwIfFatal(callbackFailure);
  		Throwable _e = Operators.onOperatorError(null, callbackFailure, originalError, context);
  		Operators.onErrorDropped(_e, context);
  	}
docs: see https://github.com/reactor/reactor-core/issues/270