# unreachable

`import { unreachable } from "destack:assert";`

Mark this code path as unreachable.

```ds title="unreachable"
export function unreachable(message?: string | undefined): never
```

[language/library/src/assert/assert.ds:90:92](https://github.com/destack-sh/destack/blob/main/language/library/src/assert/assert.ds#L90-L92)