From 4f87f875fce134fd435829fa0b46e54ef4ff15a7 Mon Sep 17 00:00:00 2001
From: Alexander Scharinger <rng.dynamics@gmail.com>
Date: Thu, 26 May 2022 00:07:17 +0200
Subject: [PATCH] Add filterfalse.__reduce__

---
 Lib/test/test_itertools.py |  2 --
 vm/src/stdlib/itertools.rs | 10 +++++++++-
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/Lib/test/test_itertools.py b/Lib/test/test_itertools.py
index 7fa961f8557..23ede28c8eb 100644
--- a/Lib/test/test_itertools.py
+++ b/Lib/test/test_itertools.py
@@ -883,8 +883,6 @@ def test_filter(self):
             c = filter(isEven, range(6))
             self.pickletest(proto, c)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_filterfalse(self):
         self.assertEqual(list(filterfalse(isEven, range(6))), [1,3,5])
         self.assertEqual(list(filterfalse(None, [0,1,0,2,0])), [0,0,0])
diff --git a/vm/src/stdlib/itertools.rs b/vm/src/stdlib/itertools.rs
index cad3dca66e2..a780e23923b 100644
--- a/vm/src/stdlib/itertools.rs
+++ b/vm/src/stdlib/itertools.rs
@@ -875,7 +875,15 @@ mod decl {
     }
 
     #[pyimpl(with(IterNext, Constructor))]
-    impl PyItertoolsFilterFalse {}
+    impl PyItertoolsFilterFalse {
+        #[pymethod(magic)]
+        fn reduce(zelf: PyRef<Self>) -> (PyTypeRef, (PyObjectRef, PyIter)) {
+            (
+                zelf.class().clone(),
+                (zelf.predicate.clone(), zelf.iterable.clone()),
+            )
+        }
+    }
     impl IterNextIterable for PyItertoolsFilterFalse {}
     impl IterNext for PyItertoolsFilterFalse {
         fn next(zelf: &Py<Self>, vm: &VirtualMachine) -> PyResult<PyIterReturn> {