summaryrefslogtreecommitdiff
path: root/testsuite/tests/warnings/should_compile/T22702a.hs
diff options
context:
space:
mode:
Diffstat (limited to 'testsuite/tests/warnings/should_compile/T22702a.hs')
-rw-r--r--testsuite/tests/warnings/should_compile/T22702a.hs25
1 files changed, 25 insertions, 0 deletions
diff --git a/testsuite/tests/warnings/should_compile/T22702a.hs b/testsuite/tests/warnings/should_compile/T22702a.hs
new file mode 100644
index 0000000000..14b0b94047
--- /dev/null
+++ b/testsuite/tests/warnings/should_compile/T22702a.hs
@@ -0,0 +1,25 @@
+{-# OPTIONS_GHC -Wmissing-role-annotations #-}
+{-# LANGUAGE RoleAnnotations #-}
+{-# LANGUAGE PolyKinds #-}
+{-# LANGUAGE StandaloneKindSignatures #-}
+module T22702a where
+
+import Data.Kind (Type)
+
+-- type with parameters
+-- warns
+type Foo :: Type -> Type -> Type
+data Foo x y = Foo x
+
+-- type without parameters
+-- doesn't warn
+data Quu = Quu1 | Quu2
+
+-- polykinded type
+-- warns, no role for `k`
+type Bar :: (k -> Type) -> k -> Type
+data Bar f a = Bar (f a)
+
+-- type-class may have roles as well
+-- doesn't warn
+class C a where