Avoid an unreachable-code note in SBCL by using (if (string-equal (lisp-implementation-version) nil) ...) instead of (if (lisp-implementation-version) ...).
Avoid an unreachable-code note in SBCL by using (if (string-equal
(lisp-implementation-version) nil) ...) instead of (if
(lisp-implementation-version) ...).

arnoo/quicklisp-client,PuercoPop/quicklisp-client,tamurashingo/quicklisp-client,quicklisp/quicklisp-client,daewok/quicklisp-client,CodyReichert/quicklisp-client