syntax_data: {"ast_node_type":"other","tokens":[{"end":19,"kind":"keyword","start":0,"text":")?)"}]}
source_snippet:                 )?)
context_before:                     iter::zip(as_.iter(), bs.iter()).map(|(a, b)| relation.relate(a, b)),
context_after:             } else if !(as_.is_empty() || bs.is_empty()) {