This is because the old peekahead squirrelled `in` in `in.prev`, which is how `in.nextToken` does it.

The point of the star is now incorrectly at `in.prev`, which points at the `case` because `in.nextToken` looks ahead on `CASE`.

I'll send along a fix, as soon as I see how best to communicate the offset from `isWildStar`.  I'm inclined to `checkWildStar: Option[Tree]`, so it either comes back or it doesn't.