1 files changed, 16 insertions, 0 deletions
diff --git a/testsuite/tests/th/T12387a.hs b/testsuite/tests/th/T12387a.hs
new file mode 100644
index 0000000000..c8ca5c942a
--- /dev/null
+++ b/testsuite/tests/th/T12387a.hs
@@ -0,0 +1,16 @@
+{-# LANGUAGE TemplateHaskell #-}
+{-# LANGUAGE TypeFamilies #-}
+
+module T12387a where
+
+import GHC.Generics
+import Language.Haskell.TH.Lib
+
+data Foo = Foo
+
+$(do d <- instanceD (cxt []) (conT ''Eq `appT` conT ''Foo)
+            [tySynInstD $ tySynEqn Nothing (conT ''Rep `appT` conT ''Foo) (conT ''Maybe)]
+     return [d])
+
+main :: IO ()
+main = print $ Foo == Foo