Debug help - delegate from dlang Tour

[Steven Schveighoffer]

On Monday, 8 September 2025 at 16:23:23 UTC, Brother Bill wrote:
> 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.
>
> Marking add static works.
>
> Still don't understand why this doesn't work.

The easiest thing to do here is to declare it static, so the 
compiler will reject any requirement of a context pointer.

I believe the case where it will infer a function vs. delegate is 
when passing a literal lambda. Other than that, you have to be 
explicit.

```d
void main() {
    int foo1() { return 1; }
    static int foo2() { return 1; }
    int function() p;
    p = &foo1; // error
    p = &foo2; // ok
    p = () { return 1; }; // ok, inferred to be a function, not 
delegate
}
```

-Steve