T21087.stderr\should_fail\deriving\tests\testsuite - delta/haskell.git - gitlab.haskell.org: ghc/ghc.git

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T21087.hs:11:25: error: [GHC-97044]
    • Class ‘KnownNat’ does not support user-specified instances.
    • In the stand-alone deriving instance for ‘KnownNat Z’