This is CVS HEAD from 5mins ago:
To reproduce:
M-x slime ; start SLIME C-x C-f foo.lisp ; get a buffer in lisp-mode C-c : ; Slime Eval: <Tab> ; slime-completie-symbol
The value NIL is not of type PACKAGE. [Condition of type TYPE-ERROR]
Restarts: 0: [ABORT] Return to SLIME toplevel. 1: [ABORT] Reduce debugger level (leaving debugger, returning to toplevel). 2: [TOPLEVEL] Restart at toplevel READ/EVAL/PRINT loop.
Backtrace: 0: (SWANK:COMPLETIONS "Eval: " NIL) 1: (SB-INT:EVAL-IN-LEXENV 2 (SWANK:COMPLETIONS "Eval: " NIL) #S(SB-KERNEL:LEXENV :FUNS NIL :VARS NIL :BLOCKS NIL :TAGS NIL :TYPE-RESTRICTIONS NIL :LAMBDA NIL :CLEANUP NIL :POLICY ((SPEED . 1) (SPACE . 1) (SAFETY . 1) (INHIBIT-WARNINGS . 1) (DEBUG . 1) (COMPILATION-SPEED . 1))))[:EXTERNAL] 2: (SWANK:EVAL-STRING "(swank:completions "Eval: " nil)" NIL 19) 3: ("hairy arg processor for SWANK::READ-FROM-EMACS" #<FILE-STREAM for "a constant string" {9915711}>)