compile time build failure of store v0.5.1 with ghc 7.10 and 7.8

Hello: is ghc 7.10 or 7.8 acutally part of the target support range or not?

https://matrix.hackage.haskell.org/#/package/store/0.5.1.0/ghc-7.10.3@1556132737 shows the build failures that happpen on those ghc versions.

the error in the matrixci builder tool is

src/Data/Store/Internal.hs:697:5:
    The exact Name ‘a_aO3e’ is not in scope
      Probable cause: you used a unique Template Haskell name (NameU), 
      perhaps via newName, but did not bind it
      If that's it, then -ddump-splices might be useful
    In the splice:
      $(derive
          [d| instance Deriving (Store All)
              instance Deriving (Store Any)
              instance Deriving (Store Void)
              instance Deriving (Store Bool)
              instance (Store a, Store b) => Deriving (Store (Either a b)) |])

src/Data/Store/Internal.hs:697:5:
    The exact Name ‘b_aO3f’ is not in scope
      Probable cause: you used a unique Template Haskell name (NameU), 
      perhaps via newName, but did not bind it
      If that's it, then -ddump-splices might be useful
    In the splice:
      $(derive
          [d| instance Deriving (Store All)
              instance Deriving (Store Any)
              instance Deriving (Store Void)
              instance Deriving (Store Bool)
              instance (Store a, Store b) => Der

one fix would be to add the constraint template-haskell > = 2.11 if 7.10 and older is no longer supported. If you intend to continue supporting those ghc versions, perhaps theres a more involved fix?

but pending that more involved fix, adding template-haskell > = 2.11 seems like a good way to roll

mgsloan / store

compile time build failure of store v0.5.1 with ghc 7.10 and 7.8 #140