[Issue 24024] cannot pass class this to ref class

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24024

--- Comment #5 from Walter Bright <bugzilla at digitalmars.com> ---
(In reply to FeepingCreature from comment #4)
> I mean, in the extreme, if this was allowed, shouldn't this happen?

It isn't any different from:

 class C
 {
     static void mem(C c1)
     {
         foo(c1);
     }
 }

 void foo(ref C c2) { c2 = null; }

 C c3 = new C;
 C.mem(c3); // c1 is a copy of c3
 assert(c3 is null); // c1 is set to null, not c3


> And what about if `c` is genuinely an rvalue, such as `C createC();
> createC.mem;`?

Rvalues cannot be passed by ref.

13116 created a special case, and like special cases, it works inconsistently
with the rest of the semantics.

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