syntax_data: {"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":"for"}]}
source_snippet:         for candidate in candidates.iter_mut().rev() {
context_before:         let mut next_candidate_start_block = if refutable { Some(otherwise_block) } else { None };
context_after:             let has_guard = candidate.has_guard;