testsuite/tests/quantified-constraints/T15316.stderr


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T15316.hs:20:13: error:
    • The constraint ‘c’ is no smaller than the instance head ‘c’
      (Use UndecidableInstances to permit this)
    • In the quantified constraint ‘c => c’
      In the type signature: subsume' :: Proxy c -> ((c => c) => r) -> r