Checked against sbcl 0.9.16 - several changes.
SBCL 0.9.16 now passes all MOP Feature Tests. This makes several changes necessary in the Closer to MOP support for SBCL, again. Therefore, support for SBCL 0.9.15 is dropped. The darcs repository has been tagged with '0.33' in case you need a version that works with SBCL 0.9.15. darcs-hash:4bfdc272ae29918f08b54d0bdc14fed29b443814