Lazy functions, lazy arrays

[Tobias Pankrath via Digitalmars-d-learn]

On Friday, 20 March 2015 at 12:15:22 UTC, Dennis Ritchie wrote:
> On Friday, 20 March 2015 at 10:38:17 UTC, John Colvin wrote:
>> I don't understand what you mean. You mean a function that 
>> isn't compiled if it isn't used anywhere?
>
> Yes. That's exactly what I mean.

Use case?