Re: Partial function application (Currying)

[Richard (Rikki) Andrew Cattermole via Digitalmars-d-learn]

Not really any other way to do it, create context (i.e. struct, or 
stack) and have a delegate point to both it and a patch function.

It'll be how partial is implemented.
https://dlang.org/phobos/std_functional.html#.partial