Why does intpromote spew warnings for ~ operator?

[Alexey]

On Sunday, 12 September 2021 at 18:13:14 UTC, Walter Bright wrote:
> On 9/12/2021 7:14 AM, Steven Schveighoffer wrote:
>> Right now, the deprecation is telling users *under penalty of 
>> not compiling* to do something that will achieve nothing when 
>> intpromote is enabled.
>
> The question for ~x is to promote x to an int and then 
> complement, or complement and then promote.. Those are not 
> equivalent.
>
> The idea is to move towards doing it the C way, which is 
> promote and then complement.

But is this really ok to change variable size for simple bit 
flipping? maybe there should be exception at least for ~ 
operation?
```D

void main()
{
     ushort a  = 0b100;
     ushort b  = ~a;
}

```

```txt
t.d(5): Deprecation: integral promotion not done for `~a`, use 
'-preview=intpromote' switch or `~cast(int)(a)`

```