testsuite/tests/arrows/gadt/T5777.stderr


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T5777.hs:13:18: error: [GHC-64525]
    • Proc patterns cannot use existential or GADT data constructors
    • In the pattern: BoolVal
      In the expression: proc BoolVal -> returnA -< ()
      In an equation for ‘arrif’: arrif = proc BoolVal -> returnA -< ()