Which Function Mode
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.
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