Variable: which-func--use-header-line
which-func--use-header-line is a buffer-local variable defined in
which-func.el.gz.
Documentation
If non-nil, display the function name in the header line.
Source Code
;; Defined in /usr/src/emacs/lisp/progmodes/which-func.el.gz
(defvar-local which-func--use-header-line nil
"If non-nil, display the function name in the header line.")