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Items are missing in a trait implementation.
Erroneous code example:
```compile_fail,E0046
trait Foo {
fn foo();
}
struct Bar;
impl Foo for Bar {}
// error: not all trait items implemented, missing: `foo`
```
When trying to make some type implement a trait `Foo`, you must, at minimum,
provide implementations for all of `Foo`'s required methods (meaning the
methods that do not have default implementations), as well as any required
trait items like associated types or constants. Example:
```
trait Foo {
fn foo();
}
struct Bar;
impl Foo for Bar {
fn foo() {} // ok!
}
```
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