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# init(upstream:prefix:file:line:)

Creates a publisher that raises a fatal error upon receiving any failure, and otherwise republishes all received input.

```
init(upstream: Upstream, prefix: String, file: StaticString, line: UInt)
```

## Parameters

`upstream`

The publisher from which this publisher receives elements.

`prefix`

The string used at the beginning of the fatal error message.

`file`

The filename used in the error message.

`line`

The line number used in the error message.

---

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