What's wrong with my usage of std.algorithm.map in this code example?

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On Tuesday, 24 May 2016 at 20:18:34 UTC, Steven Schveighoffer 
wrote:
> Slice assignment from range to array is not supported.
>
> In your example, I'm curious why the efforts to specify the 
> type? I think it would work with just saying auto itemstrings = 
> ...
>
> -Steve

I still get an error if I use auto instead.