testsuite/tests/quantified-constraints/T15334.stderr


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T15334.hs:8:6: error:
    • You can't specify an instance for a tuple constraint
    • In the quantified constraint ‘forall a. Eq a => (C m a, D m a)’
      In the type signature:
        f :: (forall a. Eq a => (C m a, D m a)) => m a