Yes, obviously the examples given in the link are bad style of comments. But sometimes you need to explain the reasons behind the (Haskell) equations, just like

Yes, obviously the examples given in the link are bad style of comments. But sometimes you need to explain the reasons behind the (Haskell) equations, just like one would do in a Math paper. So there's a use case for the literate Haskell files *.lhs (http://www.haskell.org/haskellwiki/Literate_programming http://www.haskell.org/haskellwiki/Literate_programming).