syntax_data: {"ast_node_type":"other","tokens":[{"end":47,"kind":"keyword","start":0,"text":"match"}]}
source_snippet:             match relation.relate(sz_a, sz_b) {
context_before:             let t = relation.relate(a_t, b_t)?;
context_after:                 Ok(sz) => Ok(Ty::new_array_with_const_len(cx, t, sz)),