RepPolyUnboxedPatterns.hs:8:1: error: [GHC-55287]
    The first pattern in the equation for ‘foo’
    does not have a fixed runtime representation.
    Its type is:
      (# a, b #) :: TYPE ('TupleRep '[rep1, rep2])

RepPolyUnboxedPatterns.hs:11:1: error: [GHC-55287]
    The first pattern in the equations for ‘bar’
    does not have a fixed runtime representation.
    Its type is:
      (# a | b #) :: TYPE ('SumRep '[rep1, rep2])