error: higher-ranked subtype error
  --> $DIR/issue-57611-trait-alias.rs:28:9
   |
LL |         |x| x
   |         ^^^^^

error: higher-ranked subtype error
  --> $DIR/issue-57611-trait-alias.rs:28:9
   |
LL |         |x| x
   |         ^^^^^

error[E0308]: mismatched types
  --> $DIR/issue-57611-trait-alias.rs:20:16
   |
LL |     type Bar = impl Baz<Self, Self>;
   |                ^^^^^^^^^^^^^^^^^^^^ one type is more general than the other
   |
   = note: expected type `for<'r> Fn<(&'r X,)>`
              found type `Fn<(&'static X,)>`
note: this closure does not fulfill the lifetime requirements
  --> $DIR/issue-57611-trait-alias.rs:28:9
   |
LL |         |x| x
   |         ^^^^^

error: implementation of `FnOnce` is not general enough
  --> $DIR/issue-57611-trait-alias.rs:20:16
   |
LL |     type Bar = impl Baz<Self, Self>;
   |                ^^^^^^^^^^^^^^^^^^^^ implementation of `FnOnce` is not general enough
   |
   = note: closure with signature `fn(&'static X) -> &'static X` must implement `FnOnce<(&'0 X,)>`, for any lifetime `'0`...
   = note: ...but it actually implements `FnOnce<(&'static X,)>`

error: aborting due to 4 previous errors

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