Release D 2.089.0

[John Chapman]

On Sunday, 3 November 2019 at 13:35:36 UTC, Martin Nowak wrote:
> Glad to announce D 2.089.0, ♥ to the 44 contributors.
>
> This release comes with corrected extern(C) mangling in mixin 
> templates, atomicFetchAdd and atomicFetchSub in core.atomic, 
> support for link driver arguments, better support of LDC in 
> dub, and plenty of other bug fixes and improvements.
>
> http://dlang.org/download.html
> http://dlang.org/changelog/2.089.0.html
>
> -Martin

Something has changed with core.atomic.cas - it used to work with 
`null` as the `ifThis` argument, now it throws an AV. Is this 
intentional?

If I use `cast(shared)null` it doesn't throw but if the change 
was deliberate shouldn't it be mentioned?