Idiomatic way to process const/immutable arrays as ranges

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On Monday, 11 February 2013 at 14:46:55 UTC, Dicebot wrote:
> This question is so stupid I am just struck with trying to 
> chose the "good" solution.
>
> Consider this code:
>
> string func(in string[] args)
> {
>     return args.join(" "); // compile error, args is not an 
> input range
> }
>
> It is somewhat expected as you can hardly popFront on a const 
> range. But then question is: how can I wrap const slice into a 
> mutable range without copying data (using standard 
> language/library solution)? Of course, I can do .dup.join, but 
> there is no real need to do copy, even a shallow one.

Try:
string func(string[] args)
without 'in'.