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.

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