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RepPolyNewtypePat1.hs:16:1: error:
    The first pattern in the equation for ‘bar’
    does not have a fixed runtime representation.
    Its type is:
      X a :: TYPE rep

RepPolyNewtypePat1.hs:16:6: error:
    • The newtype constructor pattern
      does not have a fixed runtime representation.
      Its type is:
        a :: TYPE rep
    • In the pattern: MkX bndr_a
      In an equation for ‘bar’: bar (MkX bndr_a) = bndr_a