diff options
Diffstat (limited to 'testsuite/tests/typecheck/should_fail/T3950.hs')
| -rw-r--r-- | testsuite/tests/typecheck/should_fail/T3950.hs | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/testsuite/tests/typecheck/should_fail/T3950.hs b/testsuite/tests/typecheck/should_fail/T3950.hs new file mode 100644 index 0000000000..127a82b04b --- /dev/null +++ b/testsuite/tests/typecheck/should_fail/T3950.hs @@ -0,0 +1,17 @@ +{-# LANGUAGE GADTs #-}
+
+module T3950 where
+
+-- Id :: (* -> * -> *) -> * -> * -> *
+data Id p x y = Id (p x y)
+
+-- Sealed :: (* -> *) -> *
+data Sealed p where
+ Sealed :: p x -> Sealed p
+
+-- w :: (* -> * -> *) -> *
+-- Id p :: * -> * -> *
+rp :: Bool -> Maybe (w (Id p))
+rp _ = Just rp'
+ where rp' :: Sealed (Id p x)
+ rp' = undefined
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