[slime-devel] slime fancy inspector breaks with class-prototype & print-object

[xristos]

swank-fancy-inspector.lisp:459

"Prototype: " ,(if (swank-mop:class-finalized-p class)
                   `(:value ,(swank-mop:class-prototype class))
                   '"#<N/A (class not finalized)>")

class-prototype will fill prototype slot of class instance
with a prototype instance. 

This will raise unbound-slot conditions for classes that have
print-object that accesses slots specialized on them, since
the instance returned by class-prototype may or may not be
initialized according to spec.

Also see: http://paste.lisp.org/display/88827

The same conditions are raised in ccl although ccl
has the with-errorfree-printing macro that slime could use
to deal with this.