1 files changed, 14 insertions, 0 deletions
diff --git a/testsuite/tests/quantified-constraints/T15359a.hs b/testsuite/tests/quantified-constraints/T15359a.hs
new file mode 100644
index 0000000000..6ec5f861a8
--- /dev/null
+++ b/testsuite/tests/quantified-constraints/T15359a.hs
@@ -0,0 +1,14 @@
+{-# LANGUAGE MultiParamTypeClasses, GADTs, RankNTypes,
+             ConstraintKinds, QuantifiedConstraints,
+             UndecidableInstances #-}
+
+module T15359a where
+
+class C a b
+class a ~ b => D a b
+
+data Dict c where
+  Dict :: c => Dict c
+
+foo :: (forall a b. C a b => D a b) => Dict (C a b) -> a -> b
+foo Dict x = x