syntax_data: {"ast_node_type":"variable","tokens":[{"end":73,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let TestCase::Or { pats } = match_pair.test_case else { bug!() };
context_before:     ) {
context_after:         debug!("expanding or-pattern: candidate={:#?}\npats={:#?}", candidate, pats);