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fixed a bug in 9.rst #157

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RecursiveContents.hs:10:5: error:
The last statement in a 'do' block must be an expression
paths <- forM properNames
$ \ name
-> do { let ...;
isDirectory <- doesDirectoryExist path;
.... }

previous code doesn't work, so must rebuild the lambda function.

RecursiveContents.hs:10:5: error:
      The last statement in a 'do' block must be an expression
      paths <- forM properNames
               $ \ name
                   -> do { let ...;
                           isDirectory <- doesDirectoryExist path;
                           .... }
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