rustc-ap-rustc_error_codes 638.0.0

Automatically published version of the package `rustc_error_codes` in the rust-lang/rust repository from commit 30ca215b4e38b32aa7abdd635c5e2d56f5724494 The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish
Documentation 
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A binding shadowed something it shouldn't.

Erroneous code example:

```compile_fail,E0530
static TEST: i32 = 0;

let r: (i32, i32) = (0, 0);
match r {
    TEST => {} // error: match bindings cannot shadow statics
}
```

To fix this error, just change the binding's name in order to avoid shadowing
one of the following:

* struct name
* struct/enum variant
* static
* const
* associated const

Fixed example:

```
static TEST: i32 = 0;

let r: (i32, i32) = (0, 0);
match r {
    something => {} // ok!
}
```