error[E0308]: mismatched types
 --> tests/ui/remote/wrong_ser.rs:9:10
  |
9 | #[derive(Serialize)]
  |          ^^^^^^^^^
  |          |
  |          expected `&u8`, found `&u16`
  |          arguments to this function are incorrect
  |
  = note: expected reference `&u8`
             found reference `&u16`
note: function defined here
 --> $WORKSPACE/serde/src/private/ser.rs
  |
  | pub fn constrain<T: ?Sized>(t: &T) -> &T {
  |        ^^^^^^^^^
  = note: this error originates in the derive macro `Serialize` (in Nightly builds, run with -Z macro-backtrace for more info)