syntax_data: {"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"(Some(normal_block),"}]}
source_snippet:             (Some(normal_block), Some(exit_block)) => {
context_before:             (None, None) => self.cfg.start_new_block().unit(),
context_after:                 let target = self.cfg.start_new_block();