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T14520.hs:15:24: error:
    • Expected kind ‘bat w w’,
        but ‘Id’ has kind ‘XXX @a0 @(*) (XXX @a0 @(a0 ~>> *) kat0 b0) b0’
      The type variables ‘kat0’, ‘b0’ are ambiguous
    • In the first argument of ‘Sing’, namely ‘(Id :: bat w w)’
      In the type signature: sId :: Sing w -> Sing (Id :: bat w w)