---
title: Publishers.Zip4.Failure
framework: combine
role: symbol
role_heading: Type Alias
path: combine/publishers/zip4/failure
---

# Publishers.Zip4.Failure

The kind of errors this publisher might publish.

## Declaration

```swift
typealias Failure = A.Failure
```

## Discussion

Discussion This publisher uses its upstream publishers’ common failure type.

## See Also

### Declaring supporting types

- [Publishers.Zip4.Output](combine/publishers/zip4/output.md)