warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
  --> $DIR/specialization-no-default.rs:1:12
   |
LL | #![feature(specialization)]
   |            ^^^^^^^^^^^^^^
   |
   = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
   = help: consider using `min_specialization` instead, which is more stable and complete
   = note: `#[warn(incomplete_features)]` on by default

error[E0520]: `foo` specializes an item from a parent `impl`, but that item is not marked `default`
  --> $DIR/specialization-no-default.rs:20:5
   |
LL | impl<T> Foo for T {
   | ----------------- parent `impl` is here
...
LL |     fn foo(&self) {}
   |     ^^^^^^^^^^^^^ cannot specialize default item `foo`
   |
   = note: to specialize, `foo` in the parent `impl` must be marked `default`

error[E0520]: `bar` specializes an item from a parent `impl`, but that item is not marked `default`
  --> $DIR/specialization-no-default.rs:23:5
   |
LL | impl<T> Foo for T {
   | ----------------- parent `impl` is here
...
LL |     fn bar(&self) {}
   |     ^^^^^^^^^^^^^ cannot specialize default item `bar`
   |
   = note: to specialize, `bar` in the parent `impl` must be marked `default`

error[E0520]: `T` specializes an item from a parent `impl`, but that item is not marked `default`
  --> $DIR/specialization-no-default.rs:37:5
   |
LL | impl<T> Bar for T {
   | ----------------- parent `impl` is here
...
LL |     type T = ();
   |     ^^^^^^ cannot specialize default item `T`
   |
   = note: to specialize, `T` in the parent `impl` must be marked `default`

error[E0520]: `baz` specializes an item from a parent `impl`, but that item is not marked `default`
  --> $DIR/specialization-no-default.rs:55:5
   |
LL | impl<T: Clone> Baz for T {
   | ------------------------ parent `impl` is here
...
LL |     fn baz(&self) {}
   |     ^^^^^^^^^^^^^ cannot specialize default item `baz`
   |
   = note: to specialize, `baz` in the parent `impl` must be marked `default`

error[E0520]: `redundant` specializes an item from a parent `impl`, but that item is not marked `default`
  --> $DIR/specialization-no-default.rs:74:5
   |
LL | impl<T: Clone> Redundant for T {
   | ------------------------------ parent `impl` is here
...
LL |     default fn redundant(&self) {}
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot specialize default item `redundant`
   |
   = note: to specialize, `redundant` in the parent `impl` must be marked `default`

error: aborting due to 5 previous errors; 1 warning emitted

For more information about this error, try `rustc --explain E0520`.