T14289c.hs:9:2-45: Splicing declarations
    [d| data Foo a
          = Foo a
          deriving (a ~ a) |]
  ======>
    data Foo a
      = Foo a
      deriving (a ~ a)
T14289c.ppr.hs:(7,2)-(9,28): Splicing declarations
    [d| data Foo a
          = Foo a
          deriving (a ~ a) |]
  ======>
    data Foo a
      = Foo a
      deriving (a ~ a)