Fix up missing coverage (#497)

Author: Tinche

HISTORY.md

@@ -50,6 +50,7 @@ can now be used as decorators and have gained new features.
 - `typing_extensions.Any` is now supported and handled like `typing.Any`.
   ([#488](https://github.com/python-attrs/cattrs/issues/488) [#490](https://github.com/python-attrs/cattrs/pull/490))
 - The BaseConverter now properly generates detailed validation errors for mappings.
+  ([#496](https://github.com/python-attrs/cattrs/pull/496))
 - [PEP 695](https://peps.python.org/pep-0695/) generics are now tested.
   ([#452](https://github.com/python-attrs/cattrs/pull/452))
 - Imports are now sorted using Ruff.

src/cattrs/converters.py

@@ -692,7 +692,7 @@ def _find_type_alias_structure_hook(self, type: Any) -> StructureHook:
         res = self.get_structure_hook(base)
         if res == self._structure_call:
             # we need to replace the type arg of `structure_call`
-            return lambda v, _, __base=base: self._structure_call(v, __base)
+            return lambda v, _, __base=base: __base(v)
         return lambda v, _, __base=base: res(v, __base)
 
     def _structure_final_factory(self, type):

tests/test_dicts.py

@@ -0,0 +1,11 @@
+from typing import Any, Dict
+
+
+def test_any_keys(converter):
+    """Dicts with any keys work."""
+    assert converter.structure({b"": "1"}, Dict[Any, int]) == {b"": 1}
+
+
+def test_any_values(converter):
+    """Dicts with any values work."""
+    assert converter.structure({"1": b"1"}, Dict[int, Any]) == {1: b"1"}