(ibuffer-aif, ibuffer-awhen, ibuffer-save-marks)

(ibuffer-aif, ibuffer-awhen, ibuffer-save-marks)
(define-ibuffer-column, define-ibuffer-sorter)
(define-ibuffer-op, define-ibuffer-filter): Add declarations
containing indentation specs, replacing equivalent top-level
forms that set `lisp-indent-function' properties.
(define-ibuffer-op): Use `derived-mode-p'.
(define-ibuffer-filter): Remove redundant `concat' call.