syntax_data: {"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // This candidate is about to become a leaf, so unset `or_span`.
context_before:         let shared_pre_binding_block = self.cfg.start_new_block();
context_after:         let or_span = candidate.or_span.take().unwrap();