---
title: Failure
framework: combine
role: symbol
role_heading: Associated Type
path: combine/publisher/failure
---

# Failure

The kind of errors this publisher might publish.

## Declaration

```swift
associatedtype Failure : Error
```

## Mentioned in

Receiving and Handling Events with Combine

## Discussion

Discussion Use Never if this Publisher does not publish errors.

## See Also

### Declaring supporting types

- [Output](combine/publisher/output.md)