Warn local deprecated

analysis_options.yaml

@@ -28,7 +28,7 @@ analyzer:
     todo: ignore
     # allow self-reference to deprecated members (we do this because otherwise we have
     # to annotate every member in every test, assert, etc, when we deprecate something)
-    deprecated_member_use_from_same_package: ignore
+    deprecated_member_use_from_same_package: warning
     # Turned off until null-safe rollout is complete.
     unnecessary_null_comparison: ignore
   exclude: