error[E0308]: mismatched types
  --> $DIR/type-params-in-different-spaces-3.rs:3:9
   |
LL | trait Tr : Sized {
   | ---------------- expected type parameter
LL |     fn test<X>(u: X) -> Self {
   |             -           ---- expected `Self` because of return type
   |             |
   |             found type parameter
LL |         u
   |         ^ expected type parameter `Self`, found type parameter `X`
   |
   = note: expected type parameter `Self`
              found type parameter `X`
   = note: a type parameter was expected, but a different one was found; you might be missing a type parameter or trait bound
   = note: for more information, visit https://doc.rust-lang.org/book/ch10-02-traits.html#traits-as-parameters

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.