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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It is not allowed to cast to a bool.

Erroneous code example:

```compile_fail,E0054
let x = 5;

// Not allowed, won't compile
let x_is_nonzero = x as bool;
```

If you are trying to cast a numeric type to a bool, you can compare it with
zero instead:

```
let x = 5;

// Ok
let x_is_nonzero = x != 0;
```