testsuite/tests/module/mod43.stderr


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mod43.hs:4:10: error:
    • Illegal instance declaration for ‘Eq String’
        (All instance types must be of the form (T t1 ... tn)
         where T is not a synonym.
         Use TypeSynonymInstances if you want to disable this.)
    • In the instance declaration for ‘Eq String’