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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Linking with `kind=framework` is only supported when targeting macOS,
as frameworks are specific to that operating system.

Erroneous code example:

```ignore (should-compile_fail-but-cannot-doctest-conditionally-without-macos)
#[link(name = "FooCoreServices", kind = "framework")] extern {}
// OS used to compile is Linux for example
```

To solve this error you can use conditional compilation:

```
#[cfg_attr(target="macos", link(name = "FooCoreServices", kind = "framework"))]
extern {}
```

See more:
https://doc.rust-lang.org/reference/attributes.html#conditional-compilation