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T4966.hs:3:14: warning: [-Wdeprecated-flags (in -Wdefault)]
    -XDatatypeContexts is deprecated: It was widely considered a misfeature, and has been removed from the Haskell language.

T4966.hs:35:30: warning: [-Wmissing-methods (in -Wdefault)]
    • No explicit implementation for
        either ‘==’ or ‘/=’
    • In the instance declaration for ‘Eq (TreeListObject a)’