fix named tuple bug

Author: brijkapadia

Lib/test/test_typing.py

@@ -8468,6 +8468,15 @@ class ThisWontWorkEither(NamedTuple):
                 def name(self):
                     return __class__.__name__
 
+    def test_named_tuple_generator_input(self):
+        field_names = ["x", "y"]
+        field_values = [int, int]
+        Point = NamedTuple("Point", zip(field_names, field_values))
+        p = Point(1, 2)
+        self.assertEqual(p.x, 1)
+        self.assertEqual(p.y, 2)
+        self.assertEqual(repr(p),"Point(x=1, y=2)")
+
 
 class TypedDictTests(BaseTestCase):
     def test_basics_functional_syntax(self):

Lib/typing.py

@@ -3044,7 +3044,7 @@ class Employee(NamedTuple):
     """
     types = {n: _type_check(t, f"field {n} annotation must be a type")
              for n, t in fields}
-    field_names = [n for n, _ in fields]
+    field_names = list(types)
     nt = _make_nmtuple(typename, field_names, _make_eager_annotate(types), module=_caller())
     nt.__orig_bases__ = (NamedTuple,)
     return nt