Re: About `lookup-key'

[Michael Heerdegen]

Xue Fuqiao <xfq.free@gmail.com> writes:

> In (info "(elisp) Functions for Key Lookup"):
>
>   If the string or vector KEY is not a valid key sequence according
>   to the prefix keys specified in KEYMAP, it must be "too long" and
>   have extra events at the end that do not fit into a single key
>   sequence.
>
> It is the documentation of the function `lookup-key'.  I have a
> question: why must it be "too long"?  Can't it be a wrong key
> sequence, such as `C-!' in the global-map?

Yes, of course - but that's not meant with "invalid" in this paragraph,
because the return value of `lookup-key' is well defined in this case.
I.e., "invalid" IMO refers to the function `key-lookup', not to the
given keymap.

Do you want to suggest a better circumscription than that given in the
manual?


Regards,

Michael.