TcCoercibleFail2.stderr\should_fail\typecheck\tests\testsuite - delta/haskell.git - gitlab.haskell.org: ghc/ghc.git

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TcCoercibleFail2.hs:5:10: error:
    • Class ‘Coercible’ does not support user-specified instances.
    • In the instance declaration for ‘Coercible () ()’