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(let ((c (c2mop:ensure-class 'my-class :metaclass 'c2mop:forward-referenced-class))) (c2mop:ensure-class-using-class c 'another-name)) ;; causes ever because of (defmethod ensure-class-using-class ((class pcl-class) name &rest args &key) (call-with-ensure-class-context class name args (lambda (class name metaclass initargs) (aver (eq name (class-name class))) (unless (eq (class-of class) metaclass) (apply #'change-class class metaclass initargs)) (apply #'reinitialize-instance class initargs) class))) #| failed AVER: (EQ SB-PCL::NAME (CLASS-NAME CLASS)) This is probably a bug in SBCL itself. (Alternatively, SBCL might have been corrupted by bad user code, e.g. by an undefined Lisp operation like (FMAKUNBOUND 'COMPILE), or by stray pointers from alien code or from unsafe Lisp code; or there might be a bug in the OS or hardware that SBCL is running on.) If it seems to be a bug in SBCL itself, the maintainers would like to know about it. Bug reports are welcome on the SBCL mailing lists, which you can find at <http://sbcl.sourceforge.net/>. [Condition of type SB-INT:BUG] Restarts: 0: [RETRY] Retry SLIME interactive evaluation request. 1: [*ABORT] Return to SLIME's top level. 2: [ABORT] abort thread (#<THREAD "worker" RUNNING {1003827EB3}>) Backtrace: 0: ((LAMBDA (CLASS SB-PCL::NAME SB-PCL::METACLASS SB-PCL::INITARGS) :IN SB-MOP:ENSURE-CLASS-USING-CLASS) #<SB-MOP:FORWARD-REFERENCED-CLASS COMMON-LISP-USER::MY-CLASS> ANOTHER-NAME #<STANDARD-CLASS COMMON.. 1: ((FLET SB-THREAD::WITH-RECURSIVE-LOCK-THUNK :IN SB-PCL::CALL-WITH-ENSURE-CLASS-CONTEXT)) 2: ((FLET "WITHOUT-INTERRUPTS-BODY-29" :IN SB-THREAD::CALL-WITH-RECURSIVE-LOCK)) 3: (SB-THREAD::CALL-WITH-RECURSIVE-LOCK #<CLOSURE (FLET SB-THREAD::WITH-RECURSIVE-LOCK-THUNK :IN SB-PCL::CALL-WITH-ENSURE-CLASS-CONTEXT) {7F963AC958AB}> #<SB-THREAD:MUTEX "World Lock" owner: #<SB-THREAD:.. 4: (SB-PCL::CALL-WITH-ENSURE-CLASS-CONTEXT #<SB-MOP:FORWARD-REFERENCED-CLASS COMMON-LISP-USER::MY-CLASS> ANOTHER-NAME NIL #<FUNCTION (LAMBDA (CLASS SB-PCL::NAME SB-PCL::METACLASS SB-PCL::INITARGS) :IN SB.. 5: ((LAMBDA ())) 6: (SB-INT:SIMPLE-EVAL-IN-LEXENV (LET ((C #)) (SB-MOP:ENSURE-CLASS-USING-CLASS C (QUOTE ANOTHER-NAME))) #<NULL-LEXENV>) 7: (EVAL (LET ((C #)) (SB-MOP:ENSURE-CLASS-USING-CLASS C (QUOTE ANOTHER-NAME)))) 8: ((LAMBDA NIL :IN SWANK:INTERACTIVE-EVAL)) --more-- |#