More fixes per feedback

making Alex write my code through comments!  Time for bed.

topaz/modules/kernel.py

@@ -10,10 +10,10 @@
 from topaz.error import RubyError, error_for_oserror
 from topaz.module import Module, ModuleDef
 from topaz.modules.process import Process
+from topaz.objects.bindingobject import W_BindingObject
 from topaz.objects.exceptionobject import W_ExceptionObject
 from topaz.objects.procobject import W_ProcObject
 from topaz.objects.stringobject import W_StringObject
-from topaz.objects.bindingobject import W_BindingObject
 
 
 class Kernel(Module):
@@ -309,7 +309,7 @@ def method_eval(self, space, w_source, w_binding=None):
         elif not isinstance(w_binding, W_BindingObject):
             raise space.error(space.w_TypeError,
                 "wrong argument type %s (expected Binding)" %
-                space.str_w(space.getclass(w_binding).name)
+                space.getclass(w_binding).name
             )
         return space.send(w_binding, space.newsymbol("eval"), [w_source])