There's a bug in sbcl that prevents us to use us as slot name when us is defined as a constant variable.

Author Pascal J. Bourguignon <pjb@informatimago.com>
Author date 2013-06-16 13:18:48
Author local date 2013-06-16 15:18:48 +0200
Committer Pascal J. Bourguignon <pjb@informatimago.com>
Committer date 2013-06-16 13:18:48
Committer local date 2013-06-16 15:18:48 +0200
Commit bcb76d7366ada0486f3dc78967213493aab98c05
Tree 82a3bd0b1e138fa07f5a306dd127af8ba2c25b1b
Parent d8ecc97b2aeef46e6f278175c4699dc57af61573
There's a bug in sbcl that prevents us to use us as slot name when us is defined as a constant variable.
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