---
title: upstream
framework: combine
role: symbol
role_heading: Instance Property
path: combine/publishers/tryscan/upstream
---

# upstream

The publisher that this publisher receives elements from.

## Declaration

```swift
let upstream: Upstream
```

## See Also

### Inspecting publisher properties

- [initialResult](combine/publishers/tryscan/initialresult.md)
- [nextPartialResult](combine/publishers/tryscan/nextpartialresult.md)