message: simplify test a bit
diff: @@ -46,10 +46,14 @@ fn insert_select() {
  let connection = connection.map_err(|e| panic!("{}", e));
  runtime.handle().spawn(connection).unwrap();
  - let create = client.prepare("CREATE TEMPORARY TABLE foo (id SERIAL, name TEXT)");
  - let create = runtime.block_on(create).unwrap();
  - let create = client.execute(&create, &[]).map(|n| assert_eq!(n, 0));
  - runtime.block_on(create).unwrap();
  + runtime
  + .block_on(
  + client
  + .prepare("CREATE TEMPORARY TABLE foo (id SERIAL, name TEXT)")
  + .and_then(|create| client.execute(&create, &[]))
  + .map(|n| assert_eq!(n, 0)),
  + )
  + .unwrap();
  let insert = client.prepare("INSERT INTO foo (name) VALUES ($1), ($2)");
  let select = client.prepare("SELECT id, name FROM foo ORDER BY id");
  