testsuite/tests/arrows/should_fail/arrowfail004.stderr


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arrowfail004.hs:12:15:
    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 }