On Linux, I checked: ccl sbcl cmucl allegro allegromodern allegro8 allegromodern8 lispworks clisp ecl ecl_bytecodes mkcl All passed, except ECL and ECL with bytecodes, both of which failed test-xach-update-bug.script But I have only ECL 13.5.1, so this may be wrong. Also note that I checked only with ACL 9. I don't have the ACL 10 release candidate on this machine. But I assume Kevin will have tested that case. On Mac, I checked: ccl clisp sbcl cmucl lispworks allegro_64 allegromodern_64 allegro8_64 allegromodern8_64 allegro_64_s allegromodern_64_s allegro8_64_s allegromodern8_64_s abcl All tests on these lisps pass. On SBCL on the Mac, with version 1.2.15.0.sbcl-1.2.15.0-4bc676e, the tests failed before running, because the ASDF build failed with a deprecation warning. That was because we use SB-DEBUG:BACKTRACE (deprecated) instead of SB-DEBUG:PRINT-BACKTRACE. I made that change and pushed. I'm hoping we don't need to protect this patch with checks to avoid earlier versions of SBCL. For Allegro on the Mac, I checked with both Allegro 9.0 and the Allegro 10.0 pre-release. I'll try Windows next, and if that works, release 3.1.6. Cheers, r