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tcfail128.hs:18:16:
    No instance for (Data.Array.Base.MArray b0 FlatVector IO)
      arising from a use of `thaw'
    Possible fix:
      add an instance declaration for
      (Data.Array.Base.MArray b0 FlatVector IO)
    In a stmt of a 'do' block: v <- thaw tmp
    In the expression:
      do { let sL = ...
               dim = length sL
               ....;
           v <- thaw tmp;
           return () }
    In an equation for `main':
        main
          = do { let sL = ...
                     ....;
                 v <- thaw tmp;
                 return () }