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-rw-r--r--testsuite/tests/indexed-types/should_fail/T14045a.hs5
1 files changed, 5 insertions, 0 deletions
diff --git a/testsuite/tests/indexed-types/should_fail/T14045a.hs b/testsuite/tests/indexed-types/should_fail/T14045a.hs
index fc545a8d41..985220c472 100644
--- a/testsuite/tests/indexed-types/should_fail/T14045a.hs
+++ b/testsuite/tests/indexed-types/should_fail/T14045a.hs
@@ -7,6 +7,11 @@ import Data.Kind
class C (a :: k) where
data S (a :: k)
+-- This used to fail with the mysterious error
+-- Type indexes must match class instance head
+-- Expected: S z
+-- Actual: S a
+-- But now it is fine
instance C (z :: Bool) where
data S :: Bool -> Type where
SF :: S False