testsuite/tests/quantified-constraints/T21006.stderr


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T21006.hs:14:10: error: [GHC-05617]
    • Could not deduce ‘c’
        arising from the head of a quantified constraint
        arising from the superclasses of an instance declaration
      from the context: (Determines b, Determines c)
        bound by a quantified context at T21006.hs:14:10-15
    • In the instance declaration for ‘OpCode’