error[E0393]: the type parameter `Rhs` must be explicitly specified
  --> $DIR/issue-22560.rs:9:23
   |
LL | / trait Sub<Rhs=Self> {
LL | |     type Output;
LL | | }
   | |_- type parameter `Rhs` must be specified for this
LL | 
LL |   type Test = dyn Add + Sub;
   |                         ^^^ help: set the type parameter to the desired type: `Sub<Rhs>`
   |
   = note: because of the default `Self` reference, type parameters must be specified on object types

error[E0393]: the type parameter `Rhs` must be explicitly specified
  --> $DIR/issue-22560.rs:9:17
   |
LL | / trait Add<Rhs=Self> {
LL | |     type Output;
LL | | }
   | |_- type parameter `Rhs` must be specified for this
...
LL |   type Test = dyn Add + Sub;
   |                   ^^^ help: set the type parameter to the desired type: `Add<Rhs>`
   |
   = note: because of the default `Self` reference, type parameters must be specified on object types

error[E0225]: only auto traits can be used as additional traits in a trait object
  --> $DIR/issue-22560.rs:9:23
   |
LL | type Test = dyn Add + Sub;
   |                 ---   ^^^
   |                 |     |
   |                 |     additional non-auto trait
   |                 |     trait alias used in trait object type (additional use)
   |                 first non-auto trait
   |                 trait alias used in trait object type (first use)

error[E0191]: the value of the associated types `Output` (from trait `Sub`), `Output` (from trait `Add`) must be specified
  --> $DIR/issue-22560.rs:9:23
   |
LL |     type Output;
   |     ------------ `Output` defined here
...
LL |     type Output;
   |     ------------ `Output` defined here
...
LL | type Test = dyn Add + Sub;
   |                 ^^^   ^^^ associated type `Output` must be specified
   |                 |
   |                 associated type `Output` must be specified
   |
help: specify the associated types
   |
LL | type Test = dyn Add<Output = Type> + Sub<Output = Type>;
   |                 ^^^^^^^^^^^^^^^^^^   ^^^^^^^^^^^^^^^^^^

error: aborting due to 4 previous errors

Some errors have detailed explanations: E0191, E0225, E0393.
For more information about an error, try `rustc --explain E0191`.