Don't crash when a TypedDict definition is recursive.

pytype/overlays/typed_dict.py

@@ -221,7 +221,9 @@ def make_class_from_pyi(self, cls_name, pytd_cls):
     )
 
     for c in pytd_cls.constants:
-      typ = self.ctx.convert.constant_to_value(c.type)
+      # The field types may refer back to the class being built.
+      with self.ctx.allow_recursive_convert():
+        typ = self.ctx.convert.constant_to_value(c.type)
       props.add(c.name, typ, total)
 
     # Process base classes and generate the __init__ signature.

pytype/tests/test_typed_dict.py

@@ -784,6 +784,24 @@ class Bar:
     """,
     )
 
+  def test_recursive(self):
+    with self.DepTree([(
+        "foo.pyi",
+        """
+      from typing import Union, Optional
+      from typing_extensions import TypedDict
+      class Foo(TypedDict, total=False):
+        name: str
+        nested: 'Foo'
+    """,
+    )]):
+      self.CheckWithErrors("""
+        import foo
+        foo.Foo(name='foo', a=1)  # wrong-keyword-args
+        # 'nested' cannot be checked because Foo is recursive.
+        foo.Foo(name='foo', nested=45)
+      """)
+
   def test_total_false(self):
     with self.DepTree([
         (