syntax_data: {"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"(Some(block),"}]}
source_snippet:             (Some(block), None) | (None, Some(block)) => block,
context_before:         match (normal_exit_block, break_block) {
context_after:             (None, None) => self.cfg.start_new_block().unit(),