minibuffer-depth-indicate-mode is an interactive autoloaded compiled Lisp function in `mb-depth.el'.

(minibuffer-depth-indicate-mode &optional ARG)

Toggle Minibuffer Depth Indication mode.
With a prefix argument ARG, enable Minibuffer Depth Indication
mode if ARG is positive, and disable it otherwise. If called
from Lisp, enable the mode if ARG is omitted or nil.

Minibuffer Depth Indication mode is a global minor mode. When
enabled, any recursive use of the minibuffer will show the
recursion depth in the minibuffer prompt. This is only useful if
`enable-recursive-minibuffers' is non-nil.