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deriving-1935.hs:18:11: warning: [-Wmissing-methods (in -Wdefault)]
    • No explicit implementation for
        ‘==’
    • In the instance declaration for ‘Eq (T a)’

deriving-1935.hs:21:11: warning: [-Wmissing-methods (in -Wdefault)]
    • No explicit implementation for
        ‘==’
    • In the instance declaration for ‘Eq (S a)’

deriving-1935.hs:22:11: warning: [-Wmissing-methods (in -Wdefault)]
    • No explicit implementation for
        either ‘compare’ or ‘<=’
    • In the instance declaration for ‘Ord (S a)’