testsuite/tests/typecheck/should_fail/tcfail073.stderr


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tcfail073.hs:8:10: error: [GHC-59692]
    Duplicate instance declarations:
      instance Eq a => Eq (a, b) -- Defined at tcfail073.hs:8:10
      instance (Eq a, Eq b) => Eq (a, b) -- Defined in ‘GHC.Classes’