T14289c.hs:9:3-44: Splicing declarations
    [d| data Foo a
          = Foo a
          deriving (a ~ a) |]
  ======>
    data Foo a
      = Foo a
      deriving (a ~ a)
T14289c.ppr.hs:(7,3)-(9,27): Splicing declarations
    [d| data Foo a
          = Foo a
          deriving (a ~ a) |]
  ======>
    data Foo a
      = Foo a
      deriving (a ~ a)