use standard syntax instead of "do" and "repeat"

Evolution Discussion
2

So “try” instead of “do”. If there is no catch, then just use braces without a keyword for a block.

And use do-while instead of repeat-while.

Do you also propose no longer marking calls to throwing functions with `try`?

Have you read the "Error-Handling Rationale" document in the Swift repository? If not, please do: <https://github.com/apple/swift/blob/master/docs/ErrorHandlingRationale.rst&gt; If so, please explain why you disagree with it.

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Brent Royal-Gordon
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