C++ pattern matching is coming

[Per Nordlöw]

On Sunday, 23 October 2022 at 01:02:16 UTC, Paul Backus wrote:
> On Sunday, 23 October 2022 at 00:12:32 UTC, ryuukk_ wrote:
> I am less optimistic about built-in sum types. The DMD frontend 
> is not really designed to accomodate adding an entire new 
> category of types to D's type system.

Can you elaborate on why this is case?

Would be interesting to hear Walter's opinion on built-in 
sum-types and obstacles in implementing them in dmd.