-"tcfail020.hs", line 12: No such instance:
- class "A", type "[a]" (at an instance declaration)
-Fail: Compilation errors found
+tcfail020.hs:12: No instance for:
+ `A [a{-aGH-}]'
+ tcfail020.hs:12:
+ in an instance declaration
+ When checking superclass constraints of an instance declaration
-ghc: execution of the Haskell compiler had trouble
+
+Compilation had errors