Why does intpromote spew warnings for ~ operator?

[bauss]

On Monday, 13 September 2021 at 22:27:11 UTC, Alexey wrote:
> On Monday, 13 September 2021 at 21:03:41 UTC, Guillaume Piolat 
> wrote:
>> On Sunday, 12 September 2021 at 14:14:03 UTC, Steven 
>> Schveighoffer wrote:
>
> It's also not exactly clear why:
> 1. D should be backward compatible with C, which is 50 years 
> old soon.
> 2. why exactly somebody should copy / paste (how many? 
> thousands?) many lines of code without thinking and rechecking. 
> Probably D can't be and shouldn't be compatible with C / C++ to 
> that distinct.
> 3. Is really backward comparability with C/C++ so important?

1. It's fairly clear why. Because a lot of the D ecosystem 
depends on C such as libraries etc. a lot of C code is/will be 
ported to D and it's impossible to do so if there are 
unclear/major behavior differences. D promotes itself with 
"betterC" which means it needs to behave like C to be a better C.

2. It's not necessarily copy-pasting but when you port code you 
don't go through it line-for-line and verify because that will 
take a very long time. There are even tools for D that allows 
porting C to D code and when using those tools you will not be 
able to verify the code that easy. Since a lot of the ecosystem 
depends on those tools then the behavior should be consistent 
with C.

3. Yes, see the first point about the ecosystem heavily relying 
on C.