[Issue 18474] Postblit not working in shared structs

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18474

--- Comment #2 from anonymous4 <dfj1esp02 at sneakemail.com> ---
Some shared objects can be copied just fine like mutex itself or FILE*, but
they don't need much of postblit. And if shared postblit is unlikely to work,
you might want to @disable this(shared this) shared;

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