There is a missing comma for backquote substitution in the following method that causes an error when inpecting logical-pathnames using SLIME. Error in function SWANK::INSPECTOR-CONTENT-FOR-EMACS: destructure-case failed: (PATHNAME-HOST PATHNAME) [Condition of type SIMPLE-ERROR] Restarts: 0: [ABORT] ABORT 1: [ABORT-REQUEST] Abort handling SLIME request. 2: [ABORT] Return to Top-Level. Backtrace: 0: (SWANK::INSPECTOR-CONTENT-FOR-EMACS ("Namestring" ": " (:VALUE "FREEDIUS:LISP;MATH;MATRICES.LISP") (:NEWLINE) "Physical pathname: " ...)) 1: (SWANK::INSPECT-OBJECT #P"FREEDIUS:LISP;MATH;MATRICES.LISP" #<SWANK-BACKEND::CMUCL-INSPECTOR {5BA62CBD}>) ... The literal form (pathname-host pathname) gets passed to SWANK::INSPECTOR-CONTENT-FOR-EMACS instead of its value. I have added the comma in the line indicated by ; <<< COMMA NEEDED HERE (defmethod inspect-for-emacs ((pathname logical-pathname) inspector) (declare (ignore inspector)) (values "A logical pathname." (append (label-value-line* ("Namestring" (namestring pathname)) ("Physical pathname: " (translate-logical-pathname pathname))) `("Host: " ,(pathname-host pathname) ; <<< COMMA NEEDED HERE " (" (:value ,(logical-pathname-translations (pathname-host pathname))) "other translations)" (:newline)) (label-value-line* ("Directory" (pathname-directory pathname)) ("Name" (pathname-name pathname)) ("Type" (pathname-type pathname)) ("Version" (pathname-version pathname)) ("Truename" (if (not (wild-pathname-p pathname)) (probe-file pathname)))))))