{"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"DiffActivity::FakeActivitySize(Some(s))"}]}
                DiffActivity::FakeActivitySize(Some(s)) => s.into(),
            let elem_bytes_size: u64 = match inputs[activity_pos + 1] {
                _ => bug!("incorrect Dualv handling recognized."),