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TyFamUndec.hs:6:1:
Variable occurs more often than in instance head
in the type family application: T (b, b)
(Use -XUndecidableInstances to permit this)
In the type synonym instance declaration for `T'
TyFamUndec.hs:7:1:
Application is no smaller than the instance head
in the type family application: T (a, Maybe b)
(Use -XUndecidableInstances to permit this)
In the type synonym instance declaration for `T'
TyFamUndec.hs:8:1:
Nested type family application
in the type family application: T (a, T b)
(Use -XUndecidableInstances to permit this)
In the type synonym instance declaration for `T'
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