[swift-evolution] Review for: Remove C-style for-loops with conditions and incrementers

[Matthew Johnson]

> Offhand (can't test right now) I suppose that means there's no use in
> adding `repeat` (or, `loop`, or whatever) to `for ... in`?

It could simplify for … in loops where there are early continue statements if there is also some logic that needs to be executed following *every* iteration, including those exited by a continue statement.  I’m not sure how common examples of this would be but they probably exist.  Where such logic exists the ‘repeat’ / ‘loop’ / etc construct would simplify it and make it less prone to error especially over time as maintenance is performed on the code.

If we introduce a construct like this we could also introduce a companion ‘between’ (keyword doesn’t really matter) which *would* do exactly what you intended.

for item in sequence {
	print("\(item)")
} between {
	print(", ")
}