[Parser recovery] DU type without `=` sign

[smoothdeveloper]

I'm wondering if this is tracked and if not, if this would be possible to recover from:

type TrackIndexOrHardwareTrackIndex
| HardwareTrack of int
| VirtualTrack of TrackIndex

VS 2022 has a code fixer for this, but maybe it is possible to recover and not break parsing and tooling for remaining of the document?

Related: #11481