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A built-in trait was implemented explicitly. All implementations of the trait
are provided automatically by the compiler.
Erroneous code example:
```compile_fail,E0322
struct Foo;
impl Sized for Foo {} // error!
```
The `Sized` trait is a special trait built-in to the compiler for types with a
constant size known at compile-time. This trait is automatically implemented
for types as needed by the compiler, and it is currently disallowed to
explicitly implement it for a type.
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