Is AliasAssign Now Official?

[evilrat]

On Thursday, 19 August 2021 at 06:23:52 UTC, surlymoor wrote:
> While reading through the spec to resolve some impressive 
> idiocy of mine, I noticed that [alias mutability (given some 
> constraints) is officially part of 
> D](https://dlang.org/spec/declaration.html#AliasAssign).

OMG! What if we wanted extra safety to avoid redefining it, a 
`const alias`?