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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Cannot take address of temporary value.

Erroneous code example:

```compile_fail,E0745
# #![feature(raw_ref_op)]
fn temp_address() {
    let ptr = &raw const 2;   // ERROR
}
```

To avoid the error, first bind the temporary to a named local variable.

```
# #![feature(raw_ref_op)]
fn temp_address() {
    let val = 2;
    let ptr = &raw const val;
}
```