Remove ugly IORef from fromRow and replace it by ugly compile time calculation :)

test/Database/PostgreSQL/OpiumSpec.hs

@@ -17,6 +17,7 @@ import Test.Hspec (SpecWith, describe, it, shouldBe, shouldSatisfy)
 
 import qualified Database.PostgreSQL.LibPQ as LibPQ
 import qualified Database.PostgreSQL.Opium as Opium
+import qualified Database.PostgreSQL.Opium.FromRow as Opium.FromRow
 
 data Person = Person
   { name :: Text
@@ -64,7 +65,7 @@ shouldHaveColumns
 shouldHaveColumns proxy conn query expectedColumns = do
   Just result <- LibPQ.execParams conn query [] LibPQ.Binary
   columnTable <- Opium.getColumnTable proxy result
-  let actualColumns = fmap (map fst . Opium.toListColumnTable) columnTable
+  let actualColumns = fmap (map fst . Opium.FromRow.toListColumnTable) columnTable
   actualColumns `shouldBe` Right expectedColumns
 
 spec :: SpecWith Connection