Remove dead code

src/cattrs/converters.py

@@ -963,14 +963,6 @@ def _get_dis_func(
             # logic.
             union_types = tuple(e for e in union_types if e is not NoneType)
 
-        # TODO: technically both disambiguators could support TypedDicts too
-        if not all(has(get_origin(e) or e) for e in union_types):
-            raise StructureHandlerNotFoundError(
-                "Only unions of attrs classes and dataclasses supported "
-                "currently. Register a structure hook manually.",
-                type_=union,
-            )
-
         return create_default_dis_func(
             self,
             *union_types,

src/cattrs/disambiguators.py

@@ -30,7 +30,7 @@
 
 
 def is_supported_union(typ: Any) -> bool:
-    """Whether the type is a union of attrs classes."""
+    """Whether the type is a union of attrs classes or dataclasses."""
     return is_union_type(typ) and all(
         e is NoneType or has(get_origin(e) or e) for e in typ.__args__
     )