[swift-evolution] Change `repeat` to loop indefinitely if no while clause is present

[Xiaodi Wu]

On Tue, May 10, 2016 at 2:27 AM, Nicholas Maccharoli via swift-evolution <
swift-evolution at swift.org> wrote:

> ​Swift Evolution ​Community,
>
> Currently writing an infinite loop in swift looks either something like
> this:
>
>     while true {
>         if ... { break }
>         //...
>     }
>
> Or this:
>
>     repeat {
>         if ... { break }
>         //...
>     } while true
>
> But I think it might be best to change the syntax / behaviour of `repeat`
> to loop
> indefinitely if no trailing while clause is present:
>
>     repeat {
>         if ... { break }
>         //...
>     }
>
> while still allowing a trailing `while` clause as in:
>
>     repeat {
>         foo += bar
>     } while foo.count < limit
>

What is your motivation for this change?


> I also want to propose that it should be a compile time error to use
> single `Bool` constants as while loop conditions, so no more `while true {
> ... }` it would become `repeat { ... }`
>

What problems are solved by forbidding `while true`?


> I was thinking of drafting a short proposal if there was enough positive
> feedback.
>
> How does it sound?
>
> - Nick
>
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