Option types and pattern matching.

[TheFlyingFiddle via Digitalmars-d]

On Sunday, 25 October 2015 at 18:23:42 UTC, Dmitry Olshansky 
wrote:
> I humbly believe that D may just add special re-write rule to 
> the switch statement in order to allow user-defined switchable 
> types. This goes along nicely with the trend - e.g. foreach 
> statement works with anything having static range interfaces or 
> opApply.

I don't think I understand this, could you elaborate?