cmpl-prefix-entry-tailcmpl-prefix-entry-tail is an alias for `cdr' in `
completion.el'. (cmpl-prefix-entry-tail LIST) Return the cdr of LIST. If arg is nil, return nil. Error if arg is not nil and not a cons cell. See also `cdr-safe'. See Info node `(elisp)Cons Cells' for a discussion of related basic Lisp concepts such as cdr, car, cons cell and list.