1 files changed, 14 insertions, 0 deletions
diff --git a/testsuite/tests/indexed-types/should_compile/Ind2_help.hs b/testsuite/tests/indexed-types/should_compile/Ind2_help.hs
new file mode 100644
index 0000000000..b088302fec
--- /dev/null
+++ b/testsuite/tests/indexed-types/should_compile/Ind2_help.hs
@@ -0,0 +1,14 @@
+{-# LANGUAGE TypeFamilies #-}
+
+module Ind2_help where
+
+class C a where
+  data T a :: *
+  unT :: T a -> a
+  mkT :: a -> T a
+
+instance (C a, C b) => C (a,b) where
+  data T (a,b) = TProd (T a) (T b)
+  unT (TProd x y) = (unT x, unT y)
+  mkT (x,y)       = TProd (mkT x) (mkT y)
+