phobos's circle CI runs a busted version of DMD

[Dukc]

On Wednesday, 11 January 2023 at 01:03:33 UTC, deadalnix wrote:
> Sample code:
> ```d
>     ushort ee = 1028;
>     ee <<= 5U;
>     ee >>= 5U;
>     writeln(ee);
> ```
>
> Regular compiler: https://godbolt.org/z/TcbjP76fW (prints 1028)
> Circle CI: 64516 .
>
> Someone, the compiler manages to do a signed arithmetic shift 
> on an unsigned.

[The spec 
says](https://dlang.org/spec/expression.html#shift_expressions) 
that `>>` means *signed* shift right. `>>>` is for unsigned 
shifts. So pedantically speaking, 64516 is the correct result.

It's another issue whether that's good design though. For one, it 
breaks the rule "do what C does, or don't compile". It'd be more 
reasonable if `>>` was type-dependant shift right (as in C) IMO.