[slime-devel] requiring swank after loading slime gives a type error in sbcl-1.0.14

[Matthew Swank]

Observe:

; SLIME 2008-02-10
STYLE-WARNING:
   redefining EMACS-INSPECT (#<BUILT-IN-CLASS FUNCTION>) in DEFMETHOD
CL-USER> (require :swank)

...

debugger invoked on a SIMPLE-TYPE-ERROR: *PACKAGE* can't be a deleted package:
*PACKAGE* has been reset to #<PACKAGE "COMMON-LISP-USER">.

Type HELP for debugger help, or (SB-EXT:QUIT) to exit from SBCL.

restarts (invokable by number or by possibly-abbreviated name):
  0: [ABORT           ] Return to SLIME's top level.
  1: [CLOSE-CONNECTION] Close SLIME connection
  2:                    Exit debugger, returning to top level.

(SB-INT:SANE-PACKAGE)

The quick and dirty fix is:

--- swank-loader.lisp.orig      2008-02-14 10:56:14.078125000 -0600
+++ swank-loader.lisp   2008-02-14 10:56:30.828125000 -0600
@@ -19,7 +19,7 @@
 ;;   (load ".../swank-loader.lisp")

 (eval-when (:compile-toplevel :load-toplevel :execute)
-  (when (find-package :swank)
+  (when (and (find-package :swank) (not (asdf:find-system :swank)))
     (delete-package :swank)
     (delete-package :swank-io-package)
     (delete-package :swank-backend)))