Multiple alias this, what's the hold up?

[12345swordy]

On Saturday, 15 June 2019 at 10:12:46 UTC, Amex wrote:
> How many years has it been in limbo? 1? 2? 3? 5? 10?
>
> What is the hold up?

What the hold up is that walter thinks it is a bad idea to 
implement multiple alias this as he think it results in a 
multiple inheritance problem. There has been recent discussion 
regarding deprecating alias this.