What is the current stage of @property ?

[Paul Backus]

On Wednesday, 10 June 2020 at 21:41:54 UTC, H. S. Teoh wrote:
> There are a few places where it's needed (like satisfying the 
> range API, which implicitly checks for it)

That may have been true at one point, but it isn't true now:

struct S {
     bool empty() { return false; }
     int front() { return 0; }
     void popFront() {}
}

static assert(isInputRange!S); // passes