RE: Is C-X ESC ESC malfunctioning?

[Drew Adams]

> If you use `repeat-complex-command' to perform the last 
> command, it will use `(count-words nil nil)'.  nil is not
> an integer or a marker, so an error arises.
> 
> > I expected the C-x ESC ESC to perform without error just as 
> > if I entered the M-x count-words What should be expected here?
> 
> I'm not sure whether it is a bug or a feature here.

A bug.

(called-interactively 'any) returns nil here, so the code then calls
`narrow-to-region' with START and END each nil.