tcfail019.hs:18:
- Could not deduce `C [a]' from the context: ()
- Probable cause: missing `C [a]' in instance declaration context
- or missing instance declaration for `C [a]'
+ Could not deduce `C [a]' from the context ()
+ Probable fix:
+ Add `C [a]' to the instance declaration context
+ Or add an instance declaration for `C [a]'
arising from an instance declaration at tcfail019.hs:18
tcfail019.hs:18:
- Could not deduce `B [a]' from the context: ()
- Probable cause: missing `B [a]' in instance declaration context
- or missing instance declaration for `B [a]'
+ Could not deduce `B [a]' from the context ()
+ Probable fix:
+ Add `B [a]' to the instance declaration context
+ Or add an instance declaration for `B [a]'
arising from an instance declaration at tcfail019.hs:18
-
-Compilation had errors
-