error[E0445]: private trait `Foo` in public interface
  --> $DIR/E0445.rs:12:1
   |
LL | trait Foo {
   | --------- `Foo` declared as private
...
LL | pub trait Bar : Foo {}
   | ^^^^^^^^^^^^^^^^^^^ can't leak private trait

warning: trait `Foo` is more private than the item `Bar`
   |
note: trait `Bar` is reachable at visibility `pub`
  --> $DIR/E0445.rs:12:1
   |
LL | pub trait Bar : Foo {}
   | ^^^^^^^^^^^^^^^^^^^
note: but trait `Foo` is only usable at visibility `pub(crate)`
  --> $DIR/E0445.rs:8:1
   |
LL | trait Foo {
   | ^^^^^^^^^
note: the lint level is defined here
  --> $DIR/E0445.rs:1:8
   |
LL | #[warn(private_bounds)]
   |        ^^^^^^^^^^^^^^

error[E0445]: private trait `Foo` in public interface
  --> $DIR/E0445.rs:14:1
   |
LL | trait Foo {
   | --------- `Foo` declared as private
...
LL | pub struct Bar2<T: Foo>(pub T);
   | ^^^^^^^^^^^^^^^^^^^^^^^ can't leak private trait

warning: trait `Foo` is more private than the item `Bar2`
   |
note: struct `Bar2` is reachable at visibility `pub`
  --> $DIR/E0445.rs:14:1
   |
LL | pub struct Bar2<T: Foo>(pub T);
   | ^^^^^^^^^^^^^^^^^^^^^^^
note: but trait `Foo` is only usable at visibility `pub(crate)`
  --> $DIR/E0445.rs:8:1
   |
LL | trait Foo {
   | ^^^^^^^^^

error[E0445]: private trait `Foo` in public interface
  --> $DIR/E0445.rs:16:1
   |
LL | trait Foo {
   | --------- `Foo` declared as private
...
LL | pub fn foo<T: Foo> (t: T) {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^ can't leak private trait

warning: trait `Foo` is more private than the item `foo`
   |
note: function `foo` is reachable at visibility `pub`
  --> $DIR/E0445.rs:16:1
   |
LL | pub fn foo<T: Foo> (t: T) {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^
note: but trait `Foo` is only usable at visibility `pub(crate)`
  --> $DIR/E0445.rs:8:1
   |
LL | trait Foo {
   | ^^^^^^^^^

error: aborting due to 3 previous errors; 3 warnings emitted

For more information about this error, try `rustc --explain E0445`.