def load_missing_constant(from_mod, const_name)
      # always default to the actual implementation
      super
    rescue LoadError, NameError => e
      load_missing_constant_error(from_mod, const_name, e)
    end
def load_missing_constant(from_mod, const_name)
      # always default to the actual implementation
      super
    rescue LoadError, NameError => e
      load_missing_constant_error(from_mod, const_name, e)
    end
Load the constant named +const_name+ which is missing from +from_mod+. If
 it is not possible to load the constant into from_mod, try its parent
 module using +const_missing+.