error[E0308]: mismatched types
  --> $DIR/type-params-in-different-spaces-3.rs:3:9
   |
LL | / trait Tr : Sized {
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`
LL | |     }
LL | | }
   | |_- expected type parameter
   |
   = 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`.