diff options
Diffstat (limited to 'testsuite/tests/indexed-types/should_fail/T4093a.hs')
| -rw-r--r-- | testsuite/tests/indexed-types/should_fail/T4093a.hs | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/testsuite/tests/indexed-types/should_fail/T4093a.hs b/testsuite/tests/indexed-types/should_fail/T4093a.hs new file mode 100644 index 0000000000..06168f577e --- /dev/null +++ b/testsuite/tests/indexed-types/should_fail/T4093a.hs @@ -0,0 +1,8 @@ +{-# LANGUAGE TypeFamilies #-}
+module T4093a where
+
+type family Foo x
+type instance Foo () = Maybe ()
+
+hang :: (Foo e ~ Maybe e) => Foo e
+hang = Just ()
|