https://issues.dlang.org/show_bug.cgi?id=19736

          Issue ID: 19736
           Summary: [Application Binary Interface]
           Product: D
           Version: D2
          Hardware: All
               URL: http://dlang.org/
                OS: All
            Status: NEW
          Severity: minor
          Priority: P3
         Component: dlang.org
          Assignee: nobody@puremagic.com
          Reporter: 13nixonf@gmail.com

https://dlang.org/spec/abi.html. Does not seem to mention anything about unions. I would assume that the abi for unions is compatible with c, but I'm wondering if any details are missing.

--