diff options
Diffstat (limited to 'testsuite/tests/deriving/should_fail/T21302.hs')
| -rw-r--r-- | testsuite/tests/deriving/should_fail/T21302.hs | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/testsuite/tests/deriving/should_fail/T21302.hs b/testsuite/tests/deriving/should_fail/T21302.hs new file mode 100644 index 0000000000..16e7cf320d --- /dev/null +++ b/testsuite/tests/deriving/should_fail/T21302.hs @@ -0,0 +1,12 @@ +{-# LANGUAGE UndecidableInstances, TypeFamilies #-} + +module T21302 where + +data BoxAssocDouble = BoxAssocDouble (BoxAssoc Int) + deriving (Eq) + +type family Assoc a + +data BoxAssoc a = BoxAssoc (Assoc a) + +deriving instance c Eq a => Eq (BoxAssoc a) |