[Sbcl-devel] sbcl bug: class-prototype of some built-in classes

[Bruno H. <br...@cl...>]

In science-fiction, a computer's answer to an unsolvable question is 42.
In SBCL as well:

  * (sb-mop:class-prototype (find-class 'sequence))
  42

But there are also some classes which are not defined as abstract by ANSI CL
and where SBCL nevertheless returns an object
p = (sb-mop:class-prototype class) with (not (eq (class-of p) class)) :

    (#<STRUCTURE-CLASS STRUCTURE-OBJECT> #S(SB-PCL::DEAD-BEEF-STRUCTURE-OBJECT))
    (#<BUILT-IN-CLASS CHARACTER> #\*)
    (#<BUILT-IN-CLASS SB-KERNEL:CODE-COMPONENT> 42)
    (#<BUILT-IN-CLASS SB-KERNEL:LRA> 42)
    (#<BUILT-IN-CLASS SB-KERNEL::RANDOM-CLASS> 42)
    (#<BUILT-IN-CLASS INTEGER> 42)
    (#<BUILT-IN-CLASS FLOAT> 42)
    (#<BUILT-IN-CLASS SIMPLE-STRING> 42)
    (#<BUILT-IN-CLASS STRING> 42)
    (#<BUILT-IN-CLASS VECTOR> 42)

Bruno