error[E0308]: mismatched types
  --> $DIR/restrict-existing-type-bounds.rs:13:12
   |
LL | impl<T: TryAdd> TryAdd for Option<T> {
   |      - this type parameter
...
LL |         Ok(self)
   |         -- ^^^^ expected `Option<<T as TryAdd>::Output>`, found `Option<T>`
   |         |
   |         arguments to this enum variant are incorrect
   |
   = note: expected enum `Option<<T as TryAdd>::Output>`
              found enum `Option<T>`
help: the type constructed contains `Option<T>` due to the type of the argument passed
  --> $DIR/restrict-existing-type-bounds.rs:13:9
   |
LL |         Ok(self)
   |         ^^^----^
   |            |
   |            this argument influences the type of `Ok`
note: tuple variant defined here
  --> $SRC_DIR/core/src/result.rs:LL:COL
help: consider further restricting this bound
   |
LL | impl<T: TryAdd<Output = T>> TryAdd for Option<T> {
   |               ++++++++++++

error[E0308]: mismatched types
  --> $DIR/restrict-existing-type-bounds.rs:26:12
   |
LL | impl<T: TryAdd<Error = X>> TryAdd for Other<T> {
   |      - this type parameter
...
LL |         Ok(self)
   |         -- ^^^^ expected `Other<<T as TryAdd>::Output>`, found `Other<T>`
   |         |
   |         arguments to this enum variant are incorrect
   |
   = note: expected struct `Other<<T as TryAdd>::Output>`
              found struct `Other<T>`
help: the type constructed contains `Other<T>` due to the type of the argument passed
  --> $DIR/restrict-existing-type-bounds.rs:26:9
   |
LL |         Ok(self)
   |         ^^^----^
   |            |
   |            this argument influences the type of `Ok`
note: tuple variant defined here
  --> $SRC_DIR/core/src/result.rs:LL:COL
help: consider further restricting this bound
   |
LL | impl<T: TryAdd<Error = X, Output = T>> TryAdd for Other<T> {
   |                         ++++++++++++

error: aborting due to 2 previous errors

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