---
title: AsyncMapSequence.Failure
framework: swift
role: symbol
role_heading: Type Alias
path: swift/asyncmapsequence/failure
---

# AsyncMapSequence.Failure

The type of the error that can be produced by the sequence.

## Declaration

```swift
typealias Failure = Base.Failure
```

## Discussion

Discussion The map sequence produces whatever type of error its base sequence does.