Execution of a form compiled with errors.
Form:
  (SB-IMPL::%DEFUN 'TEST
                 (SB-INT:NAMED-LAMBDA TEST
                     NIL
                   (BLOCK TEST
                     (DEFINE-CONDITION FOO
                         NIL
                         NIL))))
Compile-time error:
  attempt to dump reference to obsolete class: #<SB-KERNEL::UNDEFINED-CLASSOID FOO>
   [Condition of type SB-INT:COMPILED-PROGRAM-ERROR]

Restarts:
 0: [ABORT] Abort compilation.
 1: [*ABORT] Return to SLIME's top level.
 2: [ABORT] abort thread (#<THREAD "worker" RUNNING {10023FECB3}>)

Backtrace:
  0: (SB-FASL::LOAD-FASL-GROUP #S(SB-FASL::FASL-INPUT :STREAM #<SB-SYS:FD-STREAM for "file /tmp/slimePBxwLm.fasl" {1002715653}> :TABLE #(17 #<PACKAGE "SB-IMPL"> SB-IMPL::%DEFUN #<PACKAGE "PROTEST/BASE"> TE..
  1: (SB-FASL::LOAD-AS-FASL #<SB-SYS:FD-STREAM for "file /tmp/slimePBxwLm.fasl" {1002715653}> NIL NIL)
  2: ((FLET SB-FASL::THUNK :IN LOAD))
  3: (SB-FASL::CALL-WITH-LOAD-BINDINGS #<CLOSURE (FLET SB-FASL::THUNK :IN LOAD) {7FFFF64FDBFB}> #<SB-SYS:FD-STREAM for "file /tmp/slimePBxwLm.fasl" {1002715653}>)
  4: ((FLET SB-FASL::LOAD-STREAM :IN LOAD) #<SB-SYS:FD-STREAM for "file /tmp/slimePBxwLm.fasl" {1002715653}> T)
  5: (LOAD #P"/tmp/slimePBxwLm.fasl" :VERBOSE NIL :PRINT NIL :IF-DOES-NOT-EXIST T :EXTERNAL-FORMAT :DEFAULT)
  6: ((FLET SWANK/BACKEND:CALL-WITH-COMPILATION-HOOKS :IN "/home/phoe/.emacs.d/elpa/develop/slime-20171207.1712/swank/sbcl.lisp") #<CLOSURE (LAMBDA NIL :IN SWANK/BACKEND:SWANK-COMPILE-STRING) {1002714BCB}>..
  7: ((FLET SWANK/BACKEND:SWANK-COMPILE-STRING :IN "/home/phoe/.emacs.d/elpa/develop/slime-20171207.1712/swank/sbcl.lisp") "(defun test () (define-condition foo () ()))" :BUFFER "base.lisp" :POSITION 1822 ..
  8: ((LAMBDA NIL :IN SWANK:COMPILE-STRING-FOR-EMACS))
  9: ((LAMBDA NIL :IN SWANK::COLLECT-NOTES))
 10: (SWANK::MEASURE-TIME-INTERVAL #<CLOSURE (LAMBDA NIL :IN SWANK::COLLECT-NOTES) {10026D177B}>)
 11: (SWANK::COLLECT-NOTES #<CLOSURE (LAMBDA NIL :IN SWANK:COMPILE-STRING-FOR-EMACS) {10026D173B}>)
 12: (SWANK::CALL-WITH-BUFFER-SYNTAX NIL #<CLOSURE (LAMBDA NIL :IN SWANK:COMPILE-STRING-FOR-EMACS) {10026D16FB}>)
 13: (SB-INT:SIMPLE-EVAL-IN-LEXENV (SWANK:COMPILE-STRING-FOR-EMACS "(defun test () (define-condition foo () ()))" "base.lisp" (QUOTE (# #)) "/home/phoe/Projects/Lisp/protest/base/base.lisp" (QUOTE NIL)) #<..
 14: (EVAL (SWANK:COMPILE-STRING-FOR-EMACS "(defun test () (define-condition foo () ()))" "base.lisp" (QUOTE (# #)) "/home/phoe/Projects/Lisp/protest/base/base.lisp" (QUOTE NIL)))
 15: (SWANK:EVAL-FOR-EMACS (SWANK:COMPILE-STRING-FOR-EMACS "(defun test () (define-condition foo () ()))" "base.lisp" (QUOTE (# #)) "/home/phoe/Projects/Lisp/protest/base/base.lisp" (QUOTE NIL)) "#:protest..
 16: ((LAMBDA NIL :IN SWANK::SPAWN-WORKER-THREAD))
 17: (SWANK/SBCL::CALL-WITH-BREAK-HOOK #<FUNCTION SWANK:SWANK-DEBUGGER-HOOK> #<FUNCTION (LAMBDA NIL :IN SWANK::SPAWN-WORKER-THREAD) {227A78EB}>)
 18: ((FLET SWANK/BACKEND:CALL-WITH-DEBUGGER-HOOK :IN "/home/phoe/.emacs.d/elpa/develop/slime-20171207.1712/swank/sbcl.lisp") #<FUNCTION SWANK:SWANK-DEBUGGER-HOOK> #<FUNCTION (LAMBDA NIL :IN SWANK::SPAWN-W..
 19: (SWANK::CALL-WITH-BINDINGS ((*STANDARD-INPUT* . #1=#<SWANK/GRAY::SLIME-INPUT-STREAM {1002654223}>) (*STANDARD-OUTPUT* . #2=#<SWANK/GRAY::SLIME-OUTPUT-STREAM {10027366A3}>) (*TRACE-OUTPUT* . #2#) (*ERR..
 20: ((LAMBDA NIL :IN SWANK::SPAWN-WORKER-THREAD))
 21: ((FLET SB-UNIX::BODY :IN SB-THREAD::INITIAL-THREAD-FUNCTION-TRAMPOLINE))
 22: ((FLET "WITHOUT-INTERRUPTS-BODY-4" :IN SB-THREAD::INITIAL-THREAD-FUNCTION-TRAMPOLINE))
 23: ((FLET SB-THREAD::WITH-MUTEX-THUNK :IN SB-THREAD::INITIAL-THREAD-FUNCTION-TRAMPOLINE))
 24: ((FLET "WITHOUT-INTERRUPTS-BODY-1" :IN SB-THREAD::CALL-WITH-MUTEX))
 25: (SB-THREAD::CALL-WITH-MUTEX #<CLOSURE (FLET SB-THREAD::WITH-MUTEX-THUNK :IN SB-THREAD::INITIAL-THREAD-FUNCTION-TRAMPOLINE) {7FFFF64FECBB}> #<SB-THREAD:MUTEX "thread result lock" owner: #<SB-THREAD:THR..
 26: (SB-THREAD::INITIAL-THREAD-FUNCTION-TRAMPOLINE #<SB-THREAD:THREAD "worker" RUNNING {10023FECB3}> NIL #<CLOSURE (LAMBDA NIL :IN SWANK::SPAWN-WORKER-THREAD) {10023FEC5B}> NIL)
 27: ("foreign function: call_into_lisp")
 28: ("foreign function: new_thread_trampoline")