drv003.hs:14:10: warning: [-Wmissing-methods (in -Wdefault)]
    • No explicit implementation for
        either ‘==’ or ‘/=’
    • In the instance declaration for ‘Eq (Foo a)’

drv003.hs:17:10: warning: [-Wmissing-methods (in -Wdefault)]
    • No explicit implementation for
        either ‘==’ or ‘/=’
    • In the instance declaration for ‘Eq (Bar b)’