I'm back

[jerro]

> std.array.array will never work with ranges with a transient 
> front unless it
> somehow knew when it was and wasn't appropriate to dup, which 
> it's not going
> to know purely by looking at the type of front. The creator of 
> the range would
> have to tell them somehow. And even then, it wouldn't work 
> beyond the built-in
> types, because there's no generic way to dup stuff.

Daniel was actually talking about std.byLine.map!"a.dup", which 
is not a transient range, but would be considered transient if we 
did what Andrei suggests.