by cgh an hour ago
Essentially enough syntactic sugar so you could write eg the Allocator interface without manually specifying the vtable and the opaque pointer.
But yeah, Go’s system is nice and simple. I am not sure, but I think the fact that Zig programs are a single compilation unit might have some bearing on the orphan rule. There is no concept of crates so “traits”/interfaces can be defined and implemented anywhere.
That's a good point that it's all a single compilation unit which removes the orphan rule problem, but it still has the issue that there could be multiple different implementations of a trait, each from a different dependency.
Though, I am seeing your point on a simple interface system that would be enough to have something like the allocater interface, or the hash map interface.