google/lisp-koans — pull request #33 by wcn3 (2013-08-04 07:34:40+00:00)
Title: Fix thread detection to work in SBCL implementations that don't support threading.

This version of the reader macro prevents SBCL's that don't support threading (i.e. non-Linux) from erroring out when getting to the threads koan.

TESTED: verified that thread koan works on Linux, skipped on Mac OS X.