testsuite/tests/arrows/should_fail/arrowfail004.stderr


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arrowfail004.hs:12:15: error: [GHC-64525]
    • Proc patterns cannot use existential or GADT data constructors
    • In the pattern: T x
      In the expression: proc (T x) -> do returnA -< T x
      In an equation for ‘panic’: panic = proc (T x) -> do returnA -< T x