syntax_data: {"ast_node_type":"other","tokens":[{"end":85,"kind":"keyword","start":0,"text":"debug!(\"expanding"}]}
source_snippet:         debug!("expanding or-pattern: candidate={:#?}\npats={:#?}", candidate, pats);
context_before:         let TestCase::Or { pats } = match_pair.test_case else { bug!() };
context_after:         candidate.or_span = Some(match_pair.pattern_span);