Issue #16546: make ast.YieldFrom argument mandatory.
diff --git a/Lib/test/test_ast.py b/Lib/test/test_ast.py
index a8853c7..dc24126 100644
--- a/Lib/test/test_ast.py
+++ b/Lib/test/test_ast.py
@@ -399,6 +399,14 @@
compile(m, "<test>", "exec")
self.assertIn("string must be of type str", str(cm.exception))
+ def test_empty_yield_from(self):
+ # Issue 16546: yield from value is not optional.
+ empty_yield_from = ast.parse("def f():\n yield from g()")
+ empty_yield_from.body[0].body[0].value.value = None
+ with self.assertRaises(ValueError) as cm:
+ compile(empty_yield_from, "<test>", "exec")
+ self.assertIn("field value is required", str(cm.exception))
+
class ASTHelpers_Test(unittest.TestCase):