When I type program text with Slime, it tries to display function type. But when it such symbol is not created yet in lisp image, Slime displays error message in minibuffer:
Error in function SWANK::FIND-SYMBOL-OR-LOSE: Unknown symbol: "bla-bla-bla" [in #<The COMMON-LISP-USER package>])
If symbol exists, but is not function, error message is different:
(INTEGER -- Error in KERNEL:%COERCE-TO-FUNCTION: the function INTEGER is undefined.)
(This message was generated when I was editing ECASE construct).
Same error appears when I type in Slime REPL in fresh Lisp.
I use Emacs 21.3.1, CMU Common Lisp CVS snapshot 2003-12. I fetch Slime each night from CVS at 21:30 GMT (I know about special tag for stable versions, but I want to use unstable :).
The bug appeared two or three days ago. I expected such a bug to be noticed by developers soon, but it was not fixed in two or three days... :(