Re: 3.1.6 release candidate test results -- and one patch

[Robert Goldman]

Postscript:  Divergence between SBCL results on Mac and on Linux
revealed that I have antique SBCL on Linux.  Retested there, and the
BACKTRACE function replacement didn't cause a failure, so I think we are
good with PRINT-BACKTRACE.

Cheers,
r