Specified type is not checked for use! binding

Repro:

```fsharp
async {
    use! x: askjdhaskjd = failwith ""
    return 5
}
```

The type `askjdhaskjd` does not exist, but the code compiles successfully, and there are no errors in the editor.

<img width="879" height="262" alt="Image" src="https://github.com/user-attachments/assets/837cb371-2ec7-49ea-97d6-ca3217a828ef" />

.NET SDK 10.0.100-rc.2
