437c437,438
<         result.d = Private::create(&result.value, destroy);
---
>         {
>             auto result_d = Private::create(&result.value, destroy);
439,440c440,443
<         // now initialize the data
<         new (result.data()) T(std::forward<Args>(arguments)...);
---
>             // now initialize the data
>             new (result.data()) T(std::forward<Args>(arguments)...);
>             result.d = result_d; // ctor may throw an exception - result should not own d at that point
>         }