{"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":".source_file_by_stable_id(source_file_id.stable_source_file_id)"}]}
                .source_file_by_stable_id(source_file_id.stable_source_file_id)
                .source_map()
                .expect("failed to lookup `SourceFile` in new context")