Three questions on std.range

[Sam Hu]

Max Samukha Wrote:
> 3. This is a (hackish) way to detect if Range.empty's value is
> statically known. Infinite ranges must define a boolean 'empty' member
> that evaluates at compile time to false.
> 
> Probably, there should be a more generic way to do it. Something like
> isCT(alias expression) template. I kinda have one but it doesn't work
> in all cases due to a compiler bug. 

Thank you so much for all your help!

Regards,
Sam