D as a Better C

[Kagamin via Digitalmars-d-announce]

On Wednesday, 23 August 2017 at 17:43:27 UTC, Steven 
Schveighoffer wrote:
> I thought "closure" means allocating the stack onto the heap so 
> you can return the delegate with its context intact.

I understood closure as capture of variables from external 
context. They are divided into upward closures and downward 
closures, the former needs heap allocation.