message: keep assert that client needs one tls stack
diff: @@ -79,6 +79,18 @@ assert_cfg!(
  not(all(feature = "native-tls", feature = "rustls-tls")),
  "Must use exactly one of native-tls or rustls-tls features"
  );
  +assert_cfg!(
  + any(
  + all(feature = "native-tls", feature = "client"),
  + all(feature = "rustls-tls", feature = "client"),
  + all(
  + not(feature = "rustls-tls"),
  + not(feature = "native-tls"),
  + not(feature = "client")
  + ),
  + ),
  + "You must use a tls stack when using the client feature"
  +);
  macro_rules! cfg_client {
  ($($item:item)*) => {
  