What's up with the assert enhancements proposed years ago?

[Seb via Digitalmars-d]

On Friday, 23 September 2016 at 20:57:49 UTC, Nick Sabalausky 
wrote:
> Some ages ago, a whole suite of "assertPred" functions were 
> written (giving better diagnostic info, like showing "expected 
> vs actual"), were totally awesome, were submitted to 
> phobos...and were rejected because it was deemed both easy 
> enough and preferable to get these features by modifying DMD to 
> add behind-the-scenes AST magic to "assert".
>
> So...umm...yea...whatever happened to that beefed-up "assert" 
> feature?

http://wiki.dlang.org/DIP83

(needs polishing and submission to the new dip process)