a more true to guile-2.0 version of the return statment and a more tru argument checker
-rw-r--r-- 343 COPYING
-rw-r--r-- 866 COPYING-SBCL
drwxr-xr-x - guile
drwxr-xr-x - module
-rw-r--r-- 2496 test.scm