where KEY is a key binding, LABEL is a string label to display in
the buffer, and ACTION is a nullary function to call. LABEL may
be null, in which case the action will still be bound, but will
where KEY is a key binding, LABEL is a string label to display in
the buffer, and ACTION is a nullary function to call. LABEL may
be null, in which case the action will still be bound, but will