-import InstEnv ( InstInfo(..), InstEnv, pprInstInfo, classDataCon,
- simpleInstInfoTyCon, simpleInstInfoTy, isLocalInst,
- extendInstEnv )
-import TcMonoType ( tcTyVars, tcHsSigType, tcHsType, kcHsSigType )
-import TcSimplify ( tcSimplifyAndCheck )
-import TcType ( zonkTcSigTyVars )
-import HscTypes ( PersistentCompilerState(..), HomeSymbolTable, DFunId,
- ModDetails(..) )
-
-import Bag ( emptyBag, unitBag, unionBags, unionManyBags,
- foldBag, Bag, listToBag
+import InstEnv ( InstEnv, extendInstEnv )
+import TcMonoType ( tcTyVars, tcHsSigType, kcHsSigType, checkSigTyVars )
+import TcSimplify ( tcSimplifyCheck )
+import HscTypes ( HomeSymbolTable, DFunId,
+ ModDetails(..), PackageInstEnv, PersistentRenamerState