syntax_data: {"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"this.cfg.terminate(block,"}]}
source_snippet:                     this.cfg.terminate(block, source_info, TerminatorKind::Unreachable);
context_before:                 } else {
context_after:                     let end_block = this.cfg.start_new_block();