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(emacs)Which Function

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Which Function Mode
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   Which Function mode is a minor mode that displays the current
function name in the mode line, updating it as you move around in a
buffer.

   To enable (or disable) Which Function mode, use the command `M-x
which-function-mode'.  This command is global; it applies to all
buffers, both existing ones and those yet to be created.  However, it
only takes effect in certain major modes, those listed in the value of
`which-func-modes'.  If the value is `t', then Which Function mode
applies to all major modes that know how to support it--in other words,
all the major modes that support Imenu.