Losing 32 bits of a void pointer

[sumo]

On Wednesday, 19 February 2014 at 02:39:39 UTC, sumo wrote:
> I am using D & epoll on Fedora 3.12.10-300.fc20.x86_64 and am 
> running into a very odd issue.

For giggles the D kevent version on FreeBSD has no problems 
(80079af00 is pointer to the event object):

Before kevent:
0x800799f40:    0x0000000000000007      0x000000000005ffff
0x800799f50:    0x0000000000000000      0x000000080079af00 <---
0x800799f60:    0x00000000004fdca0      0x0000000000000000
0x800799f70:    0x000000080079af80      0x0000000000000000
0x800799f80:    0x00000000004fcc60      0x0000000000000000
0x800799f90:    0x0000000000000000      0x0000000000000000
0x800799fa0:    0x0000000000508ae0      0x0000000000000000
0x800799fb0:    0x00000000d2040200      0x0000000000000000
0x800799fc0:    0x00000000005141a0      0x0000000000000000
0x800799fd0:    0x0000000800798fc0      0x0000000801817070


After kevent:
0x7fffffffd778: 0x0000000000000007      0x000000000000ffff
0x7fffffffd788: 0x0000000000000001      0x000000080079af00 <---
0x7fffffffd798: 0x0000000800798f40      0x00007fffffffd7c0
0x7fffffffd7a8: 0x000000000041deb0      0x000000080079af80
0x7fffffffd7b8: 0x0000000800798f40      0x00007fffffffd850
0x7fffffffd7c8: 0x00000000004222a3      0x0000000000405990
0x7fffffffd7d8: 0x00007fffffffd82f      0x0000000800798f40
0x7fffffffd7e8: 0x0000000000000000      0x0000000000422440
0x7fffffffd7f8: 0x000000080079af80      0x0000000000000000
0x7fffffffd808: 0x0000000000422380      0x0000000001807000

I couldn't get gdb to print the actual structure - <incomplete 
type>