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

[Nick Sabalausky via Digitalmars-d]

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?