;; last. If com is not nil, the viper-digit-argument command was
;; called from within viper-prefix-arg command, such as `d', `w',
;; etc., i.e., the user typed, say, d2. In this case, `com' would be
;; last. If com is not nil, the viper-digit-argument command was
;; called from within viper-prefix-arg command, such as `d', `w',
;; etc., i.e., the user typed, say, d2. In this case, `com' would be