lambda function with "capture by value"

[Simon Bürger via Digitalmars-d-learn]

On Saturday, 5 August 2017 at 18:54:22 UTC, ikod wrote:
> Maybe std.functional.partial can help you.

Nope.

	int i = 1;
	alias dg = partial!(writeln, i);
	i = 2;
	dg();

still prints '2' as it should because 'partial' takes 'i' as a 
symbol, which is - for this purpose - kinda like "by reference".

Anyway, I solved my problem already a while ago by replacing 
delegates with custom struct's that implement the call-operator. 
I started this thread just out of curiosity, because as I see it, 
the purpose of lambdas is pretty much to remove the need for such 
custom constructions.