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-Indexing
-========
-
-.. module:: fun
-
-This section contains functions to find elements by its values.
-
-.. function:: index(x, gen, param, state)
-              iterator:index(x)
-
-   :param x: a value to find
-   :returns: the position of the first element that equals to the **x**
-
-   The function returns the position of the first element in the given iterator
-   which is equal (using ``==``) to the query element, or ``nil`` if there is
-   no such element.
-
-   Examples:
-
-   .. code-block:: lua
-
-    > print(index(2, range(0)))
-    nil
-
-    > print(index("b", {"a", "b", "c", "d", "e"}))
-    2
-
-.. function:: index_of(x, gen, param, state)
-              iterator:index_of(x)
-
-   An alias for :func:`index`.
-
-.. function:: elem_index(x, gen, param, state)
-              iterator:elem_index(x)
-
-   An alias for :func:`index`.
-
-.. function:: indexes(x, gen, param, state)
-              iterator:indexes(x)
-
-   :param x: a value to find
-   :returns: an iterator which positions of elements that equal to the **x**
-
-   The function returns an iterator to positions of elements which equals to 
-   the query element.
-
-   Examples:
-
-   .. code-block:: lua
-
-    > each(print, indexes("a", {"a", "b", "c", "d", "e", "a", "b", "a", "a"}))
-    1
-    6
-    9
-    10
-
-   .. seealso:: :func:`filter`
-
-.. function:: indices(x, gen, param, state)
-              iterator:indices(x)
-
-   An alias for :func:`indexes`.
-
-.. function:: elem_indexes(x, gen, param, state)
-              iterator:elem_indexes(x)
-
-   An alias for :func:`indexes`.
-
-.. function:: elem_indices(x, gen, param, state)
-              iterator:elem_indices(x)
-
-   An alias for :func:`indexes`.
-
-