On Monday, 8 September 2025 at 14:42:01 UTC, evilrat wrote:
probably because you have declared nested function `add` inside
`main`, this creates a delegate closure capturing `main` scope,
if you don't want that just mark `add` static.
Yep, as a nested function, this is a delegate, not a function, so
incompatible.
The following code works:
```
import std.stdio;
void main()
{
foo();
}
// Global function. Doesn't work if nested non-static function
int add(int lhs, int rhs)
{
return lhs + rhs;
}
void foo()
{
int doSomething(int function(int, int) doer)
{
// call passed function
return doer(5, 6);
}
doSomething(&add);
}
```
