create a buffer index.
For example, see the value of `fortran-imenu-generic-expression'
-used by `fortran-mode' with `imenu-syntax-alist' set locally to
-give the characters which normally have \"symbol\" syntax
+used by `fortran-mode' with `imenu-syntax-alist' set locally so that
+characters which normally have \"symbol\" syntax are considered to have
\"word\" syntax during matching.")
;;;###autoload(put 'imenu-generic-expression 'risky-local-variable t)