Why does intpromote spew warnings for ~ operator?

[Walter Bright]

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.