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Greatly improve E0322 explanation

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Guillaume Gomez 2020-02-20 14:26:56 +01:00
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src/librustc_error_codes/error_codes/E0322.md
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The `Sized` trait was implemented explicitly.
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