Did you know; we need this operator!

[Salih Dincer]

I have been looking at [this first draft by 
Rikki](https://gist.github.com/rikkimax/33d8cac529c1f4e4ea94b2d4b53cfcb5) for a few days now. We have discussed it many times before:

* [First Draft: Member of 
Operator](https://forum.dlang.org/post/xtmwtmkhmufpzeyrsxsb@forum.dlang.org)
* [Type Inference for Struct/Enum 
Literals](https://forum.dlang.org/post/zbugncpaooowjsxldzue@forum.dlang.org)
* [The enum type inference problem is easily solved with 
identifier 
types](https://forum.dlang.org/post/tvnnoujdmaedgertbdes@forum.dlang.org)

Finally we have this. Because it is the best way to solve the 
example below!

```d
alias DaysoftheWeekinEnglish D;

void main()
{
   // with (Days)
   auto days = [
       "Pazar"     : D.Sunday,
       "Pazartesi" : D.Monday,
       "Salı"      : D.Tuesday,
       "Çarşamba"  : D.Wednesday,
       "Perşembe"  : D.Thursday,
       "Cuma"      : D.Friday,
       "Cumartesi" : D.Saturday
   ];
   assert(days["Cuma"] == DaysoftheWeekinEnglish.Friday);
   assert(days["Pazar"] == D.Sunday);
```

In this example, if you open the with() scope, everything works 
inside the scope and the object is created correctly. However, 
outside the scope, the object does not actually exist!

However, Rikki wrote that the proposed draft for this example 
would not be a solution. However, with() looks nice but should be 
used with caution.

SDB at 79