1 files changed, 12 insertions, 0 deletions
diff --git a/testsuite/tests/driver/T16608/MyInteger.hs b/testsuite/tests/driver/T16608/MyInteger.hs
new file mode 100644
index 0000000000..a7c731ed8c
--- /dev/null
+++ b/testsuite/tests/driver/T16608/MyInteger.hs
@@ -0,0 +1,12 @@
+module MyInteger
+  ( MyInteger (MyInteger)
+  , ToMyInteger (toMyInteger)
+  ) where
+
+newtype MyInteger = MyInteger Integer
+
+class ToMyInteger a where
+  toMyInteger :: a -> MyInteger
+
+instance ToMyInteger Integer where
+  toMyInteger = MyInteger {- . succ -}