Remove unused all_subclasses()

dedupe/variables/base.py

@@ -5,7 +5,7 @@
 from dedupe import predicates
 
 if TYPE_CHECKING:
-    from typing import Any, ClassVar, Generator, Iterable, Optional, Sequence, Type
+    from typing import Any, ClassVar, Iterable, Sequence, Type
 
     from dedupe._typing import Comparator, PredicateFunction, VariableDefinition
 
@@ -47,15 +47,6 @@ def __getstate__(self) -> dict[str, Any]:
 
         return odict
 
-    @classmethod
-    def all_subclasses(
-        cls,
-    ) -> Generator[tuple[Optional[str], Type["Variable"]], None, None]:
-        for q in cls.__subclasses__():
-            yield getattr(q, "type", None), q
-            for p in q.all_subclasses():
-                yield p
-
 
 class DerivedType(Variable):
     type = "Derived"