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* @error: Out parameter for a #GError.
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* Calls the modify_objects_sync method on the given backend.
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e_cal_backend_sync_modify_objects (ECalBackendSync *backend,
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e_return_data_cal_error_if_fail (backend && E_IS_CAL_BACKEND_SYNC (backend), InvalidArg);
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e_return_data_cal_error_if_fail (E_CAL_BACKEND_SYNC_GET_CLASS (backend)->modify_objects_sync != NULL, UnsupportedMethod);