DIP77 - Fix unsafe RC pass by 'ref'

[Martin Nowak via Digitalmars-d]

On 04/09/2015 01:10 AM, Walter Bright wrote:
> http://wiki.dlang.org/DIP77

In the first problem example:

 struct S {
     RCArray!T array;
 }
 void main() {
     auto s = S(RCArray!T([T()])); // s.array's refcount is now 1
     foo(s, s.array[0]);           // pass by ref
 }
 void foo(ref S s, ref T t) {
     s.array = RCArray!T([]);      // drop the old s.array
     t.doSomething();              // oops, t is gone
 }

What do you do to pin s.array?

auto tmp = s;

or

auto tmp = s.array;