Squash warning.

Signed-off-by: Edward Z. Yang <[email protected]>

Author: ezyang

Cabal/Distribution/InstalledPackageInfo.hs

@@ -46,7 +46,7 @@ import Distribution.Compat.Prelude
 
 import Distribution.ParseUtils
 import Distribution.License
-import Distribution.Package hiding (installedUnitId, installedComponentId, installedPackageId)
+import Distribution.Package hiding (installedUnitId, installedPackageId)
 import qualified Distribution.Package as Package
 import Distribution.ModuleName
 import Distribution.Version