pop & popFront combined

["Nordlöw" via Digitalmars-d-learn]

On Saturday, 20 September 2014 at 19:23:46 UTC, Jakob Ovrum wrote:
> If you want move semantics, use `moveFront`.

But x.moveFront doesn't modify x.

What I want is to transform my uses of std.range from

if (!x.empty)
{
     x.front.doStuff;
     x.popFront;
}

into

if (!x.empty)
     if (auto front = x.stealFront)
     {
         front.doStuff;
     }

This is more functional/atomic, that is it reduces the risk of 
accidentally forgetting to call popFront at the end.

Destroy!