Added testcase for #9069

testsuite/tests/deriving/should_compile/T9069.hs

+{-# LANGUAGE DeriveTraversable #-}
+
+module T9069 where
+
+import Data.Foldable
+import Data.Traversable
+
+data Trivial a = Trivial a
+   deriving (Functor,Foldable,Traversable)
\ No newline at end of file

testsuite/tests/deriving/should_compile/all.T

@@ -50,3 +50,4 @@ test('T8893', normal, compile, [''])
 test('T8950', expect_broken(8950), compile, [''])
 test('T8963', normal, compile, [''])
 test('T7269', normal, compile, [''])
+test('T9069', normal, compile, [''])