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+module WhereIn4 where
+
+--A definition can be demoted to the local 'where' binding of a friend declaration,
+--if it is only used by this friend declaration.
+
+--Demoting a definition narrows down the scope of the definition.
+--In this example, demote the top level 'sq' to 'sumSquares'
+--In this case (there is single matches), if possible,
+--the parameters will be folded after demoting and type sigature will be removed.
+
+sumSquares x y = sq p x + sq p y
+         where p=2  {-There is a comment-}
+
+sq::Int->Int->Int
+sq pow z = z^pow  --there is a comment
+
+anotherFun 0 y = sq y
+     where  sq x = x^2
+