{"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"assert_ne!(scc1_placeholder,"}]}
                    assert_ne!(scc1_placeholder, scc2_placeholder);
                if let Some(scc2_placeholder) = succ_bound {
                    return Err(self.placeholder_error(scc1_placeholder, scc2_placeholder));