-drvfail004.hs:5: No instance for: `PrelBase.Eq (Foo taDH taDI)'
- arising from an instance declaration at drvfail004.hs:5
- When checking superclass constraints of an instance declaration
+drvfail004.hs:5:
+ Could not deduce `Eq (Foo a b)'
+ (arising from an instance declaration at drvfail004.hs:5)
+ from the context (Ord a, Ord b)
+ Probable cause: missing `Eq (Foo a b)' in instance declaration context
+ or missing instance declaration for `Eq (Foo a b)'
+ When checking the superclasses of an instance declaration
Compilation had errors