T19921.hs:29:8: error: [GHC-05617]
    • Could not deduce ‘r’
        arising from the head of a quantified constraint
        arising from the head of a quantified constraint
        arising from a use of ‘Dict’
      from the context: (x \/ y) \/ z
        bound by a quantified context at T19921.hs:29:8-11
      or from: (x ⇒ r, (y \/ z) ⇒ r)
        bound by a quantified context at T19921.hs:29:8-11
    • In the expression: Dict
      In an equation for ‘dict’: dict = Dict