Rant after trying Rust a bit

[Walter Bright via Digitalmars-d]

On 7/23/2015 8:03 AM, Dicebot wrote:
> At the same time one HUGE deal breaker with rust traits that rarely gets
> mentioned is the fact that they are both constraints and interfaces at the same
> time:
>
> // this is template constraint, it will generate new `foo` symbol for each new T
> fn foo <T : InputRange> (range : T)
>
> // this use the very same trait definition but creates "fat pointer" on demand
> with simplistic dispatch table
> fn foo (range : InputRange)
>
> It kills all the necessity for hacks like RangeObject and is quite a salvation
> once you get to defining dynamic shared libraries with stable ABI.
>
> This is probably my most loved feature of Rust.

D interface types also produce the simplistic dispatch table, and if you make 
them extern(C++) they don't need a RangeObject. I know it isn't as convenient as 
what you describe above, but it can be pressed into service.