syntax_data: {"ast_node_type":"other","tokens":[{"end":23,"kind":"keyword","start":0,"text":"cx,"}]}
source_snippet:                     cx,
context_before:                 Ok(Ty::new_tup_from_iter(
context_after:                     iter::zip(as_.iter(), bs.iter()).map(|(a, b)| relation.relate(a, b)),