docs: def help_info(self, exc, decorated_function, arg_name, arg_spec):
  		""" Print debug information to stderr. (Do nothing if object was constructed with silent_checks=True)
  
  		:param exc: raised exception
  		:param decorated_function: target function (function to decorate)
  		:param arg_name: function parameter name
  		:param arg_spec: function parameter specification
  
  		:return: None
  		"""
  		if self._silent_checks is not True:
  			print('Exception raised:', file=sys.stderr)
  			print(str(exc), file=sys.stderr)
  			fn_name = Verifier.function_name(decorated_function)
  			print('Decorated function: %s' % fn_name, file=sys.stderr)
  			if decorated_function.__doc__ is not None:
  				print('Decorated function docstrings:', file=sys.stderr)
  				print(decorated_function.__doc__, file=sys.stderr)
  			print('Argument "%s" specification:' % arg_name, file=sys.stderr)
  			if isfunction(arg_spec):
  				print(getsource(arg_spec), file=sys.stderr)
  			else:
  				print(str(arg_spec), file=sys.stderr)
  			print('', file=sys.stderr)