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-rw-r--r--testsuite/tests/gadt/gadt-escape1.hs3
1 files changed, 3 insertions, 0 deletions
diff --git a/testsuite/tests/gadt/gadt-escape1.hs b/testsuite/tests/gadt/gadt-escape1.hs
index 4ff33b299b..d90d6a951a 100644
--- a/testsuite/tests/gadt/gadt-escape1.hs
+++ b/testsuite/tests/gadt/gadt-escape1.hs
@@ -12,6 +12,9 @@ hval = Hidden (ExpInt 0) (ExpInt 1)
-- With the type sig this is ok, but without it maybe
-- should be rejected becuase the result type is wobbly
-- weird1 :: ExpGADT Int
+--
+-- And indeed it is rejected by GHC 7.8 because OutsideIn
+-- doesn't unify under an equality constraint.
weird1 = case (hval :: Hidden) of Hidden (ExpInt _) a -> a
-- Hidden t (ExpInt (co :: t ~ Int) _ :: ExpGADT t) (a :: ExpGADT t)