Allow dynamic creation of generic dataclasses (GH-6319)
diff --git a/Lib/dataclasses.py b/Lib/dataclasses.py
index bd7252c..04e07f8 100644
--- a/Lib/dataclasses.py
+++ b/Lib/dataclasses.py
@@ -1004,7 +1004,9 @@
anns[name] = tp
namespace['__annotations__'] = anns
- cls = type(cls_name, bases, namespace)
+ # We use `types.new_class()` instead of simply `type()` to allow dynamic creation
+ # of generic dataclassses.
+ cls = types.new_class(cls_name, bases, {}, lambda ns: ns.update(namespace))
return dataclass(cls, init=init, repr=repr, eq=eq, order=order,
unsafe_hash=unsafe_hash, frozen=frozen)