Explain function syntax

[monkyyy]

On Wednesday, 17 September 2025 at 22:16:50 UTC, Brother Bill 
wrote:
> ```
> import std.stdio;
>
> void main()
> {
>
> }
>
> alias Calculator = int function(int);
>
> Calculator makeCalculator()
> {
> 	int increment = 10;
> 	return value => increment + value; // ← compilation ERROR
> }
>
> ```

function is almost always wrong you need to be very pure to work 
at all and if by chance you ever have a function pointer you can 
convert it to a delegate

> What does the second (int) refer to?

it takes an int, just delete the names of the arguments from the 
header syntax