Strange struct/atomicLoad behaviour

[d coder]

Greetings

Here is a small piece of code that uses atomicLoad on a shared data, and
behaves strange. Any clues whether this is a problem with
atomicLoad(druntime) or with the DMD itself. I see the problem with the
2.060 release as well as with the github's current snapshot.

When I compile and run the code on my 64bit Ubuntu 12.10 machine, it prints
out
42
4294967296

Now, if I comment out the constructor of the Foo struct (which anyway I am
not using), I get the right result that is
42
42

Any clues?

Regards
- Puneet

import core.atomic;

struct Foo {
  public ulong _s = 0;
  public this (ulong s)  {
    this._s = s;
  }
}

auto foo () {
  import std.stdio;
  shared static Foo bar;
  bar._s = 42;
  writeln(bar._s);
  shared Foo frop = atomicLoad(bar);
  writeln(frop._s);
  return frop;
}

void main() {
  foo();
}
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