1 files changed, 15 insertions, 0 deletions
diff --git a/testsuite/tests/th/T4056.hs b/testsuite/tests/th/T4056.hs
new file mode 100644
index 0000000000..211d2b51f4
--- /dev/null
+++ b/testsuite/tests/th/T4056.hs
@@ -0,0 +1,15 @@
+{-# LANGUAGE TemplateHaskell, TypeFamilies, RankNTypes, FlexibleContexts #-}
+
+module T4056 where
+import Language.Haskell.TH
+
+astTest :: Q [Dec]
+astTest = [d|
+    class C t where
+        op :: [t] -> [t]
+        op = undefined
+  |]
+
+class D t where
+  bop :: [t] -> [t]
+  bop = undefined