doOnError method
Invokes the given callback function when the Single emits an error.
Example
Single<int>.error(Exception())
.doOnError((error, stacktrace) => print('oh no'))
.listen(null); // prints 'Oh no'
Implementation
Single<T> doOnError(void Function(Object, StackTrace) onError) =>
forwardSingleWithSink(
() => _DoStreamSingleSink(onErrorCallback: onError), true);