Ranges of char and wchar

[Nick Sabalausky via Digitalmars-d]

On 5/8/2014 2:46 PM, Walter Bright wrote:
>
> But to make a lazy version from an eager one means reimplementing it.
>

Or yield()-ing inside the eager one's sink.

And note also there is such as thing as a stackless "fiber", so I'm not 
certain a full-fledged context-switching fiber would necessarily be 
required (although it might - stackless fibers do have limitations).