Apply suggestion from @AlexWaygood

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

Author: bkap123

Lib/typing.py

@@ -3044,8 +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 = list(types)
-    nt = _make_nmtuple(typename, field_names, _make_eager_annotate(types), module=_caller())
+    nt = _make_nmtuple(typename, types, _make_eager_annotate(types), module=_caller())
     nt.__orig_bases__ = (NamedTuple,)
     return nt