deriving-1935.hs:17:11: warning: [-Wmissing-methods (in -Wdefault)]
    • No explicit implementation for
        either ‘==’ or ‘/=’
    • In the instance declaration for ‘Eq (T a)’

deriving-1935.hs:20:11: warning: [-Wmissing-methods (in -Wdefault)]
    • No explicit implementation for
        either ‘==’ or ‘/=’
    • In the instance declaration for ‘Eq (S a)’

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