effect.
Major modes should modify this variable using `add-function', for example:
- (add-function :before-until (local 'eldoc-documentation-function)
- #'foo-mode-eldoc-function)
+ (add-function :before-until (local \\='eldoc-documentation-function)
+ #\\='foo-mode-eldoc-function)
so that the global documentation function (i.e. the default value of the
variable) is taken into account if the major mode specific function does not
return any documentation.")