Let's improve D's exceptions

[weaselcat via Digitalmars-d]

On Wednesday, 13 May 2015 at 19:24:09 UTC, Jacob Carlborg wrote:
> Yeah, I really hate that people are using plain Exception 
> instead of creating a subclass. I'm trying to point this out in 
> pull requests and similar but it's hard to get people to listen.
>

With how range focused/@nogc a lot of phobos code has become 
exceptions have almost become useless, and we're back to throwing 
errors anyways.
Bad situation.