2 tcfail042.hs:16: Context `{PrelBase.Num taHh}'
3 required by inferred type, but missing on a type signature
4 `PrelBase.Num' `taHh' arising from an instance declaration at tcfail042.hs:16
5 When checking superclass constraints of an instance declaration
7 tcfail042.hs:4: Module Main must include a definition for `Main.main'
10 Compilation had errors