diff options
Diffstat (limited to 'testsuite/tests/typecheck/should_fail/T12785b.hs')
| -rw-r--r-- | testsuite/tests/typecheck/should_fail/T12785b.hs | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/testsuite/tests/typecheck/should_fail/T12785b.hs b/testsuite/tests/typecheck/should_fail/T12785b.hs index 951b04c6cd..6de914d2b3 100644 --- a/testsuite/tests/typecheck/should_fail/T12785b.hs +++ b/testsuite/tests/typecheck/should_fail/T12785b.hs @@ -1,6 +1,7 @@ {-# LANGUAGE RankNTypes, TypeOperators, ViewPatterns #-} {-# LANGUAGE TypeFamilies #-} {-# LANGUAGE DataKinds, PolyKinds, GADTs #-} +{-# LANGUAGE StandaloneKindSignatures #-} module T12785b where @@ -13,7 +14,8 @@ data HTree n a where Leaf :: HTree (S n) a Branch :: a -> HTree n (HTree (S n) a) -> HTree (S n) a -data STree (n ::Peano) :: forall a . (a -> Type) -> HTree n a -> Type where +type STree :: forall (n :: Peano) -> forall a. (a -> Type) -> HTree n a -> Type +data STree n f s where SPoint :: f a -> STree Z f (Point a) SLeaf :: STree (S n) f Leaf SBranch :: f a -> STree n (STree (S n) f) stru -> STree (S n) f (a `Branch` stru) @@ -33,6 +35,7 @@ hmap f (Point a) = Point (f a) hmap f Leaf = Leaf hmap f (a `Branch` tr) = f a `Branch` hmap (hmap f) tr -type family Payload (n :: Peano) (s :: HTree n x) :: x where +type Payload :: forall x. forall (n :: Peano) (s :: HTree n x) -> x +type family Payload n s where Payload Z (Point a) = a Payload (S n) (a `Branch` stru) = a |