I suppose you guys didn't notice this because you use Slime:
CL-USER(1): (loadsys defclass-star)
; loading system definition from
; /home/sky/projects/lisp/defclass-star/defclass-star.asd into
; #<PACKAGE "ASDF0">
; loading system definition from
; /home/sky/.sbcl/systems/asdf-system-connections.asd into #<PACKAGE "ASDF1">
; registering #<SYSTEM ASDF-SYSTEM-CONNECTIONS {A896251}> as
; ASDF-SYSTEM-CONNECTIONS
; registering #<SYSTEM :DEFCLASS-STAR {AAC6AC1}> as DEFCLASS-STAR
; registering #<SYSTEM #:DEFCLASS-STAR.TEST {ABEFC29}> as DEFCLASS-STAR.TEST
; registering #<SYSTEM-CONNECTION DEFCLASS-STAR-AND-CONTEXTL {AE51521}> as
; DEFCLASS-STAR-AND-CONTEXTL
; registering #<SYSTEM-CONNECTION DEFCLASS-STAR-AND-UCW {B03B859}> as
; DEFCLASS-STAR-AND-UCW
; registering #<SYSTEM-CONNECTION DEFCLASS-STAR-AND-COMPUTED-CLASS {B21BE41}>
; as DEFCLASS-STAR-AND-COMPUTED-CLASS
; registering #<SYSTEM-CONNECTION DEFCLASS-STAR-AND-CL-DEF {A788F29}> as
; DEFCLASS-STAR-AND-CL-DEF
debugger invoked on a SB-KERNEL:SIMPLE-PACKAGE-ERROR in thread #<THREAD "initial thread"
RUNNING {A698551}>:
The name "SWANK" does not designate any package.
...
Leslie