1 files changed, 15 insertions, 0 deletions
diff --git a/testsuite/tests/quantified-constraints/T2893c.hs b/testsuite/tests/quantified-constraints/T2893c.hs
new file mode 100644
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+++ b/testsuite/tests/quantified-constraints/T2893c.hs
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+{-# LANGUAGE QuantifiedConstraints  #-}
+
+module T2893c where
+
+data Rose f x = Rose x (f (Rose f x))
+
+instance Eq a => Eq (Rose f a)  where
+  (Rose x1 _) == (Rose x2 _) = x1==x2
+
+-- Needs superclasses
+instance (Ord a, forall b. Ord b => Ord (f b))
+      => Ord (Rose f a)  where
+  (Rose x1 rs1) >= (Rose x2 rs2)
+     = x1 >= x2 && rs1 == rs2
+  a <= b = False  -- Just to suppress the warning