[Issue 19987] New: std.variantN wastes space

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19987

          Issue ID: 19987
           Summary: std.variantN wastes space
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: minor
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: john.loughran.colvin at gmail.com

Because the function pointer is stored before the union and for anything other
than small sizes the union is larger (and has larger alignment), if you ask for
a size of 24 you get 48 as the total size, as opposed to 32 if the fptr and
union order is swapped.

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