diff --git a/tests/functional/r/regression/regression_3595_notcallable_collections.py b/tests/functional/r/regression/regression_3595_notcallable_collections.py
new file mode 100644
index 0000000000..120b26a048
--- /dev/null
+++ b/tests/functional/r/regression/regression_3595_notcallable_collections.py
@@ -0,0 +1,13 @@
+# pylint: disable=missing-docstring,unused-import
+# https://github.com/PyCQA/pylint/issues/3595
+
+import collections
+
+class Example:
+    def __init__(self):
+        self.prev()
+        self.next()
+    def prev(self):
+        pass
+    def next(self):
+        pass
diff --git a/tests/functional/r/regression/regression_4221_object_instanceattr.py b/tests/functional/r/regression/regression_4221_object_instanceattr.py
new file mode 100644
index 0000000000..4c346b1458
--- /dev/null
+++ b/tests/functional/r/regression/regression_4221_object_instanceattr.py
@@ -0,0 +1,8 @@
+# pylint: disable=missing-docstring
+# https://github.com/PyCQA/pylint/issues/4221
+
+import random
+o = object()
+if random.choice([True, False]):
+    o.count = None
+"abc".count("a")