How should I return multiple const values from a function?

[Salih Dincer]

On Tuesday, 3 January 2023 at 01:56:10 UTC, Paul Backus wrote:
> On Monday, 2 January 2023 at 23:25:48 UTC, Charles Hixson wrote:
>>
>> They syntax I wanted was something like:
>>
>> bool func (const out Key k, const out Val v) { k = 
>> this.key.dup; v = this.val.dup; return true;    }
>
> This works for me:

```d
template Fun(Key, Value)
{
   import std.typecons;

   alias Tup = Tuple!(const(Key), const(Value));

   enum Fun = (Key k, Value v) => Tup(k, v);/*
   auto Fun(Key k, Value v) {
    return Tup(k, v);
   }//*/
}
string k;
uint v;

auto res = Fun(k, v);

static assert(is(typeof(res[0]) == const(string))); // false
static assert(is(typeof(res[1]) == const(uint))); //false
```
I rewrote the code to return the enum.  However, static asserts 
return false.  What could this cause?

P.S. Actually the code works when we don't use enum.

SDB at 79