syntax_data: {"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if let Some(last_candidate) = candidates_to_expand.last_mut() {
context_before:         // (for trivial or-patterns), and avoid useless work (for never patterns).
context_after:             self.test_remaining_match_pairs_after_or(span, scrutinee_span, last_candidate);