diff --git a/tests/functional/r/regression_02/regression_3979.py b/tests/functional/r/regression_02/regression_3979.py
new file mode 100644
index 0000000000..25426af218
--- /dev/null
+++ b/tests/functional/r/regression_02/regression_3979.py
@@ -0,0 +1,9 @@
+import os
+from typing import TYPE_CHECKING, Any, Union
+
+if TYPE_CHECKING:
+    BasePathLike = os.PathLike[Any] # <-- that is where pylint identifies E1136
+else:
+    BasePathLike = os.PathLike
+
+foo : Union[str, BasePathLike] = "bar"