syntax_data: {"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"self.cfg.terminate(block,"}]}
source_snippet:             self.cfg.terminate(block, source_info, TerminatorKind::Unreachable);
context_before:             let source_info = self.source_info(rustc_span::DUMMY_SP);
context_after:             self.cfg.start_new_block().unit()