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-rw-r--r--testsuite/tests/printer/Makefile5
-rw-r--r--testsuite/tests/printer/Test19850.hs14
-rw-r--r--testsuite/tests/printer/all.T1
3 files changed, 20 insertions, 0 deletions
diff --git a/testsuite/tests/printer/Makefile b/testsuite/tests/printer/Makefile
index b6f05c16d1..1d0fc14f87 100644
--- a/testsuite/tests/printer/Makefile
+++ b/testsuite/tests/printer/Makefile
@@ -597,3 +597,8 @@ Test19839:
Test19840:
$(CHECK_PPR) $(LIBDIR) Test19840.hs
$(CHECK_EXACT) $(LIBDIR) Test19840.hs
+
+.PHONY: Test19850
+Test19850:
+ $(CHECK_PPR) $(LIBDIR) Test19850.hs
+ $(CHECK_EXACT) $(LIBDIR) Test19850.hs
diff --git a/testsuite/tests/printer/Test19850.hs b/testsuite/tests/printer/Test19850.hs
new file mode 100644
index 0000000000..38dc156103
--- /dev/null
+++ b/testsuite/tests/printer/Test19850.hs
@@ -0,0 +1,14 @@
+{-# LANGUAGE PatternSynonyms, ViewPatterns #-}
+{-# LANGUAGE ImplicitParams #-}
+{-# LANGUAGE RecordWildCards #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE PolyKinds #-}
+{-# LANGUAGE TypeApplications #-}
+
+module Test19850 where
+
+data Proxy (a :: k) = Proxy
+data Con k (a :: k) = Con (Proxy a)
+
+tyApp :: Con k a -> Proxy a
+tyApp (Con @kx @ax (x :: Proxy ax)) = x :: Proxy (ax :: kx)
diff --git a/testsuite/tests/printer/all.T b/testsuite/tests/printer/all.T
index b868427bfd..916ed6bbee 100644
--- a/testsuite/tests/printer/all.T
+++ b/testsuite/tests/printer/all.T
@@ -135,3 +135,4 @@ test('Test19821', ignore_stderr, makefile_test, ['Test19821'])
test('Test19834', ignore_stderr, makefile_test, ['Test19834'])
test('Test19839', ignore_stderr, makefile_test, ['Test19839'])
test('Test19840', ignore_stderr, makefile_test, ['Test19840'])
+test('Test19850', ignore_stderr, makefile_test, ['Test19850'])