SUBTYPEP problems
In conversation, Ernst notes the following implementation differences:
;; (subtypep (gensym) t) ->
;; clisp-2.49: -------- error - invalid type specification
;; sbcl-1.2.11: ------- t, t
;; ccl-1.11-rc1-r16620: t, t
;; abcl-1.3.2: -------- t, t
;; (subtypep (gensym) 'atom) ->
;; clisp-2.49: -------- error - invalid type specification
;; sbcl-1.2.11: ------- nil, nil
;; ccl-1.11-rc1-r16620: nil, nil
;; abcl-1.3.2: -------- t, t
;; (subtypep (gensym) 'sequence) ->
;; clisp-2.49: -------- error - invalid type specification
;; sbcl-1.2.11: ------- nil, nil
;; ccl-1.11-rc1-r16620: nil, nil
;; abcl-1.3.2: -------- nil, t
;; (typenamep (gensym)) ->
;; clisp-2.49: -------- nil, t (error exit)
;; sbcl-1.2.11: ------- nil, nil
;; ccl-1.11-rc1-r16620: nil, nil
;; abcl-1.3.2: -------- t, t
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