error[E0046]: not all trait items implemented, missing: `foo`
  --> $DIR/trivial_impl_sized.rs:15:1
   |
LL | /     fn foo()
LL | |     where
LL | |         Self: Sized;
   | |____________________- `foo` from trait
...
LL |   impl Foo for i32 {}
   |   ^^^^^^^^^^^^^^^^ missing `foo` in implementation

error[E0046]: not all trait items implemented, missing: `foo`
  --> $DIR/trivial_impl_sized.rs:19:1
   |
LL | /     fn foo()
LL | |     where
LL | |         Self: Sized;
   | |____________________- `foo` from trait
...
LL |   impl Foo for dyn std::fmt::Debug {}
   |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `foo` in implementation

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0046`.