3 files changed, 28 insertions, 0 deletions
diff --git a/testsuite/tests/th/T18612.hs b/testsuite/tests/th/T18612.hs
new file mode 100644
index 0000000000..ea7c007c51
--- /dev/null
+++ b/testsuite/tests/th/T18612.hs
@@ -0,0 +1,14 @@
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE TemplateHaskell #-}
+{-# OPTIONS_GHC -ddump-splices #-}
+module T18612 where
+
+import Data.Functor.Identity
+import Data.Proxy
+import Language.Haskell.TH
+
+f :: $(arrowT `appT` (conT ''Identity `appT` (tupleT 1 `appT` (tupleT 0)))
+              `appT` (conT ''Identity `appT` (tupleT 1 `appT` (tupleT 0))))
+f $(conP 'Identity [tupP [tupP []]]) = $(conE 'Identity `appE` tupE [tupE []])
+
+type G = $(conT ''Proxy `appT` (promotedTupleT 1 `appT` (tupleT 0)))
diff --git a/testsuite/tests/th/T18612.stderr b/testsuite/tests/th/T18612.stderr
new file mode 100644
index 0000000000..25286ef671
--- /dev/null
+++ b/testsuite/tests/th/T18612.stderr
@@ -0,0 +1,13 @@
+T18612.hs:14:11-68: Splicing type
+    conT ''Proxy `appT` (promotedTupleT 1 `appT` (tupleT 0))
+  ======>
+    Proxy ('Solo ())
+T18612.hs:(10,7)-(11,75): Splicing type
+    arrowT `appT` (conT ''Identity `appT` (tupleT 1 `appT` (tupleT 0)))
+      `appT` (conT ''Identity `appT` (tupleT 1 `appT` (tupleT 0)))
+  ======>
+    Identity (Solo ()) -> Identity (Solo ())
+T18612.hs:12:4-36: Splicing pattern
+    conP 'Identity [tupP [tupP []]] ======> Identity (Solo())
+T18612.hs:12:41-78: Splicing expression
+    conE 'Identity `appE` tupE [tupE []] ======> Identity (Solo ())
diff --git a/testsuite/tests/th/all.T b/testsuite/tests/th/all.T
index 6d4a5036d7..e53b0d872a 100644
--- a/testsuite/tests/th/all.T
+++ b/testsuite/tests/th/all.T
@@ -513,3 +513,4 @@ test('T18102b', extra_files(['T18102b_aux.hs']), compile_and_run, [''])
 test('T18121', normal, compile, [''])
 test('T18123', normal, compile, [''])
 test('T18388', normal, compile, [''])
+test('T18612', normal, compile, [''])