tcfail106.hs:11:10: error: [GHC-39999]
    • No instance for ‘S Int’
        arising from the superclasses of an instance declaration
    • In the instance declaration for ‘C Int’

tcfail106.hs:14:10: error: [GHC-39999]
    • No instance for ‘S Int’
        arising from the superclasses of an instance declaration
    • In the instance declaration for ‘D Int’