hslua-marshalling: fix for GHC 8.0 and 8.2
@@ -41,7 +41,7 @@ import HsLua.Core as Lua
import Control.Monad.Fail (MonadFail (..))
#endif
#if !MIN_VERSION_base(4,12,0)
-import Data.Semigroup (Semigroup)
+import Data.Semigroup (Semigroup ((<>)))
#endif
import qualified HsLua.Core.Utf8 as Utf8
