Calypso and the future of D

[Kagamin via Digitalmars-d]

On Friday, 23 January 2015 at 18:43:30 UTC, Andrei Alexandrescu 
wrote:
> 2. We (or Calypso) define D class counterparts for polymorphic 
> types thrown from C++, notably std::exception and subtypes. 
> N.B. those are D classes, not D structs

Wouldn't it be easier with structs? They lack only one feature - 
inheritance, while classes lack many features necessary to value 
types: being a value type and deterministic destruction.