Announcing Swift 5.9.1 for Linux and Windows

[sspringer (Stefan Springer)]

@sspringer

Unfortunately the project is closed source so I cannot give it to you, I would have to reduce the project accordingly (I should try).

In the other topic there is a public project mentioned that has the same problem and so anyone should be able to test the issue, and I suppose this other topic is the right place to continue any discussion of the issue.