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T15962.hs:27:11: error:
    • Found hole: _ :: Big ks -> Big (Eval (Map Dual ks))
      Where: ‘ks’ is a rigid type variable bound by
               the type signature for:
                 dualBig :: forall (ks :: [OpKind]).
                            Big ks -> Big (Eval (Map Dual ks))
               at T15962.hs:26:1-45
    • In an equation for ‘dualBig’: dualBig = _
    • Relevant bindings include
        dualBig :: Big ks -> Big (Eval (Map Dual ks))
          (bound at T15962.hs:27:1)
      Valid hole fits include
        dualBig :: Big ks -> Big (Eval (Map Dual ks))
          (bound at T15962.hs:27:1)

T15962.hs:33:12: error:
    Variable not in scope: iDontExist :: Big ('Conjunction : ks)