3 Ambiguous occurrence ‘D1’
4 It could refer to either ‘Mod164_A.D1’,
5 imported from ‘Mod164_A’ at mod164.hs:4:1-15
6 (and originally defined at Mod164_A.hs:3:10-11)
8 imported from ‘Mod164_B’ at mod164.hs:5:1-15
9 (and originally defined at Mod164_B.hs:3:10-11)