syntax_data: {"ast_node_type":"variable","tokens":[{"end":29,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let otherwise_block =
context_before:         let mut candidate_refs = candidates.iter_mut().collect::<Vec<_>>();
context_after:             self.match_candidates(match_start_span, scrutinee_span, block, &mut candidate_refs);