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[1 of 3] Compiling T21087b_aux[boot] ( T21087b_aux.hs-boot, T21087b_aux.o-boot )

T21087b_aux.hs-boot:11:25: error:
    • Class ‘KnownNat’ does not support user-specified instances.
    • In the stand-alone deriving instance for ‘KnownNat Z’
[3 of 3] Compiling T21087b_aux      ( T21087b_aux.hs, T21087b_aux.o )

T21087b_aux.hs:11:25: error:
    • Class ‘KnownNat’ does not support user-specified instances.
    • In the stand-alone deriving instance for ‘KnownNat Z’