mod180.hs:8:5: error:
    • Couldn't match expected type ‘T’
                  with actual type ‘main:Mod180_A.T’
      NB: ‘T’ is defined at Mod180_B.hs:3:1-10
          ‘main:Mod180_A.T’ is defined at Mod180_A.hs:3:1-10
    • In the expression: x
      In an equation for ‘z’: z = x