Get the return type of the function

[Meta via Digitalmars-d-learn]

On Thursday, 4 February 2016 at 02:06:00 UTC, xtreak wrote:
> Thanks for the reply. But the issue was about knowing the type 
> of lambda in map.

Yes, I was just making sure that I knew why ReturnType!lambda was 
failing, which is that it is a template and does not have a 
return type until it is instantiated with arguments.