core.atomic and composite types

[David Nadlinger via Digitalmars-d]

Currently, core.atmoic contains severe bugs and is virtually 
untested for composite types. For example: 
https://issues.dlang.org/show_bug.cgi?id=12823.

The question is: What kind of types we actually want to support? 
Or, to phrase it differently, is there a reason not to support 
arbitrary structs of the right sizes?

David