error[E0369]: binary operation `==` cannot be applied to type `S<T>`
  --> $DIR/invalid-bin-op.rs:2:15
   |
LL |     let _ = s == t;
   |             - ^^ - S<T>
   |             |
   |             S<T>
   |
   = note: the trait `std::cmp::PartialEq` is not implemented for `S<T>`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0369`.