Raise save errors

pyiron_workflow/storage.py

@@ -231,14 +231,16 @@ def _save(
         if self._fallback(cloudpickle_fallback):
             attacks += [(self._CLOUDPICKLE, cloudpickle.dump)]
 
-        e = None
+        e: Exception | None = None
         for suffix, save_method in attacks:
+            e = None
             p = filename.with_suffix(suffix)
             try:
                 with open(p, "wb") as filehandle:
                     save_method(node, filehandle)
                 return
-            except Exception:
+            except Exception as ee:
+                e = ee
                 p.unlink(missing_ok=True)
         if e is not None:
             raise e

tests/unit/test_storage.py

@@ -2,6 +2,9 @@
 from pathlib import Path
 from tempfile import TemporaryDirectory
 
+import cloudpickle
+from pint import UnitRegistry
+
 from pyiron_workflow.nodes.function import as_function_node
 from pyiron_workflow.nodes.standard import UserInput
 from pyiron_workflow.storage import PickleStorage, TypeNotFoundError, available_backends
@@ -134,6 +137,21 @@ def Unimportable(x):
         finally:
             interface.delete(node=u, cloudpickle_fallback=True)
 
+    def test_uncloudpickleable(self):
+        ureg = UnitRegistry()
+        with self.assertRaises(
+                TypeError,
+                msg="Sanity check that this can't even be cloudpickled"
+        ):
+            cloudpickle.dumps(ureg)
+
+        interface = PickleStorage(cloudpickle_fallback=True)
+        n = UserInput(ureg, label="uncloudpicklable_node")
+        with self.assertRaises(
+                TypeError,
+                msg="Exception should be caught and saving should fail"
+        ):
+            interface.save(n)
 
 if __name__ == "__main__":
     unittest.main()