3 Duplicate or overlapping instance declarations
5 defined at tcfail073.hs:7 and imported from module `PrelTup'
8 Could not deduce `Eq a' from the context: (Eq (a, b))
9 Probable cause: missing `Eq a' in instance declaration context
10 arising from use of `==' at tcfail073.hs:8
11 In the right-hand side of an equation for `==': m == o
13 Compilation had errors