Attachment: Download

Issue Description:

When running the test in the attached SwiftPM project the following code produces an incorrect result:

func test() {
    let changeStatus = ChangeStatus()
    
    let moreAvailable: Bool
    if case ChangeStatus.Status.noPendingChanges = changeStatus.status {
        moreAvailable = false
    } else {
        moreAvailable = true
    }
    XCTAssertTrue(moreAvailable)
}

By default ChangeStatus.status is set to inconsistent so we expect moreAvailable to be true. But the assertion fails when ran with the following command:

swift test -Xswiftc -enable-testing -c release

The compiler appears to optimize away the entire if/else statement.

In debug mode the test passes.