error[E0401]: can't use type parameters from outer function
  --> $DIR/E0401.rs:14:38
   |
LL | fn foo<T>(x: T) {
   |        - type variable from outer function
LL |     fn bar<U, V: Baz<U>, W: Fn()>(y: T) { //~ ERROR E0401
   |        --------------------------    ^ use of type variable from outer function
   |        |
   |        help: try using a local type parameter instead: `bar<U, V: Baz<U>, W: Fn(), T>`

error[E0401]: can't use type parameters from outer function
  --> $DIR/E0401.rs:19:16
   |
LL | fn foo<T>(x: T) {
   |        - type variable from outer function
...
LL |            (y: T) { //~ ERROR E0401
   |                ^ use of type variable from outer function
   |
   = help: try using a local type parameter instead

error[E0401]: can't use type parameters from outer function
  --> $DIR/E0401.rs:32:25
   |
LL | impl<T> Iterator for A<T> {
   | ---- `Self` type implicitely declared here, on the `impl`
...
LL |         fn helper(sel: &Self) -> u8 { //~ ERROR E0401
   |            ------       ^^^^ use of type variable from outer function
   |            |
   |            help: try using a local type parameter instead: `helper<Self>`

error: aborting due to 3 previous errors

If you want more information on this error, try using "rustc --explain E0401"