syntax_data: {"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"assert_eq!(builder.cfg.start_new_block(),"}]}
source_snippet:         assert_eq!(builder.cfg.start_new_block(), START_BLOCK);
context_after:         assert_eq!(builder.new_source_scope(span, lint_level), OUTERMOST_SOURCE_SCOPE);