-"tcfail019.hs", line 20: No such instance:
- class "B", type "[a]" (at an instance declaration)
-Fail: Compilation errors found
+tcfail019.hs:20: No instance for:
+ `B [a{-anU-}]'
+ tcfail019.hs:20:
+ in an instance declaration
+ When checking methods of an instance declaration
+
+tcfail019.hs:20: No instance for:
+ `C [a{-anU-}]'
+ tcfail019.hs:20:
+ in an instance declaration
+ When checking methods of an instance declaration
+
+tcfail019.hs:20: No instance for:
+ `B [a{-anU-}]'
+ tcfail019.hs:20:
+ in an instance declaration
+ When checking superclass constraints of an instance declaration
+
+tcfail019.hs:20: No instance for:
+ `C [a{-anU-}]'
+ tcfail019.hs:20:
+ in an instance declaration
+ When checking superclass constraints of an instance declaration
+
-ghc: execution of the Haskell compiler had trouble
+Compilation had errors