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| author | Simon Peyton Jones <simonpj@microsoft.com> | 2012-04-22 17:54:51 +0100 |
|---|---|---|
| committer | Simon Peyton Jones <simonpj@microsoft.com> | 2012-04-22 17:54:51 +0100 |
| commit | 48bafff12ed5658b08c74c529c4c0b747c3968e9 (patch) | |
| tree | 5c17da9e4f2460e5d867a63889667915626c2e88 /testsuite/tests/polykinds/T6020.hs | |
| parent | f8cc68f1226b55358ace5fc9d275bdf556176661 (diff) | |
| download | haskell-48bafff12ed5658b08c74c529c4c0b747c3968e9.tar.gz | |
Test Trac #6020
Diffstat (limited to 'testsuite/tests/polykinds/T6020.hs')
| -rw-r--r-- | testsuite/tests/polykinds/T6020.hs | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/testsuite/tests/polykinds/T6020.hs b/testsuite/tests/polykinds/T6020.hs new file mode 100644 index 0000000000..fa7de49030 --- /dev/null +++ b/testsuite/tests/polykinds/T6020.hs @@ -0,0 +1,17 @@ +{-# LANGUAGE DataKinds, FunctionalDependencies, FlexibleInstances,
+ UndecidableInstances, PolyKinds, KindSignatures,
+ ConstraintKinds, FlexibleContexts #-}
+module T6020 where
+
+import GHC.Prim (Constraint)
+
+class Id (a :: k) (b :: k) | a -> b
+instance Id a a
+
+class Test (x :: a) (y :: a) | x -> y
+instance (Id x y, Id y z) => Test x z
+
+test :: Test True True => ()
+test = ()
+
+foo = test
|