syntax_data: {"ast_node_type":"other","tokens":[{"end":58,"kind":"keyword","start":0,"text":"candidate.or_span"}]}
source_snippet:         candidate.or_span = Some(match_pair.pattern_span);
context_before:         debug!("expanding or-pattern: candidate={:#?}\npats={:#?}", candidate, pats);
context_after:         candidate.subcandidates = pats