which-func-mode

which-func-mode is an alias for `which-function-mode' in `which-func.el'.


(which-func-mode &optional ARG)

This function is obsolete since 24.1;
use `which-function-mode' instead.

Toggle mode line display of current function (Which Function mode).
With a prefix argument ARG, enable Which Function mode if ARG is
positive, and disable it otherwise. If called from Lisp, enable
the mode if ARG is omitted or nil.

Which Function mode is a global minor mode. When enabled, the
current function name is continuously displayed in the mode line,
in certain major modes.