Associative Arrays with elements having function type?

[monkyyy]

On Monday, 3 November 2025 at 22:36:56 UTC, monkyyy wrote:
> On Monday, 3 November 2025 at 21:29:47 UTC, kdevel wrote:
>> Yesterday I read
>>
>>     3. Neither the KeyTypes nor the element types of an 
>> associative array
>>     can be function types or void.
>>
>>
>
> I read this as poorly written for "aa's dont magically know how 
> to look up typeinfo" and have never ran into such a restriction

compiles:
```d
int foo(int){return 1;}
int bar(int a){return a;}
alias T=typeof(&foo);
T[T] foobar;
unittest{
	foobar[&bar]=&foo;
	foobar[&foo]=&bar;
}
```