Changes the failure type declared by the upstream publisher.
- iOS 13.0+Beta
- macOS 10.15+Beta
- Mac Catalyst 13.0+Beta
- tvOS 13.0+Beta
- watchOS 6.0+Beta
- Xcode 11.0+Beta
Failuretype presented by this publisher.
A publisher that appears to send the specified failure type.
The publisher returned by this method cannot actually fail with the specified type and instead just finishes normally. Instead, you use this method when you need to match the error types of two mismatched publishers.