Calling an unbound method on a C extension class without providing
   an instance can yield a segfault.  Try "Exception.__init__()" or
   "ValueError.__init__()".

   This is a simple fix. The error-reporting bits in call_method
   mistakenly treat the misleadingly-named variable "func" as a
   function, when in fact it is a method.

   If we let get_func_name take care of the work, all is fine.