Can you push something like this to avoid a warning? I don't remember if I
can commit.
--- a/swank/backend.lisp
+++ b/swank/backend.lisp
@@ -1386,6 +1386,9 @@ return nil.
Return :interrupt if an interrupt occurs while waiting."
(declare (ignore streams timeout))
+ ;; This defvar can't be moved to 'backend.lisp' because the initializing
form isn't evaluable
+ ;; until an implementation method is loaded for
(preferred-communication-style)
+ (declare (special swank:*communication-style*))
;; Invoking the slime debugger will just endlessly loop.
(call-with-debugger-hook
nil
