Ranges of char and wchar

[Nick Sabalausky via Digitalmars-d]

On 5/8/2014 4:13 PM, Walter Bright wrote:
> 8/2014 12:22 PM, Nick Sabalausky wrote:
>> 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.
>
> The data is still supplied to it.

I think I've lost track of what you mean here. What data is still 
supplied to what, and what point does that illustrate?