error[E0599]: no method named `foo_one` found for type `MyStruct` in the current scope
  --> $DIR/specialization-trait-not-implemented.rs:22:29
   |
LL | struct MyStruct;
   | ---------------- method `foo_one` not found for this
...
LL |     println!("{}", MyStruct.foo_one());
   |                             ^^^^^^^ method not found in `MyStruct`
   |
   = note: the method `foo_one` exists but the following trait bounds were not satisfied:
           `MyStruct : Foo`
   = help: items from traits can only be used if the trait is implemented and in scope
   = note: the following trait defines an item `foo_one`, perhaps you need to implement it:
           candidate #1: `Foo`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0599`.