Expanding What's Allowed for `where` in a for-in loop?

Evolution Pitches
5

This seems like healthy competition to me.

case _ where let id = Int(id), (40000..<50000).contains(id):

case _:
  guard let id = Int(id), (40000..<50000).contains(id) else {
    fallthrough
  }

More than one "case _:"s yield the following warning, regardless of what you do in those cases, and fallthrough skips the logic of the next case, so this is as much a missing feature with switch as it is with for.

Case is already handled by previous patterns; consider removing it

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