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T4966.hs:1:14: Warning:
    -XDatatypeContexts is deprecated: It was widely considered a misfeature, and has been removed from the Haskell language.

T4966.hs:34:10: Warning:
    No explicit implementation for
      either ‛==’ or ‛/=’
    In the instance declaration for ‛Eq (TreeListObject a)’