Implicit enum conversions are a stupid PITA

[bearophile]

Nick Sabalausky:
> I fear it's probably too late for that for D, but I do like it very much. If 
> I ever make a C-style langauge myself, I'll definitely consider something 
> like that.

Adding to dmd a few warnings activated by a compiler switch that help avoid bugs in porting C->D2 is an additive change, it's fully backwards compatible, so it can be added with no problems, if there's desire and time to implement it.

Bye,
bearophile