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| author | Chris Midgley <chris.midgley@dunecomputers.co.uk> | 2021-07-20 20:13:08 +0100 |
|---|---|---|
| committer | Chris Midgley <chris.midgley@dunecomputers.co.uk> | 2021-07-20 20:30:07 +0100 |
| commit | 320d049e876579cd5c57be17e791a519f9b852a0 (patch) | |
| tree | 4607f927aa21ee3d75c0c79856d35fbb640fe4dc /compiler/rustc_error_codes/src | |
| parent | 5c0ca08c662399c1c864310d1a20867d3ab68027 (diff) | |
| download | rust-320d049e876579cd5c57be17e791a519f9b852a0.tar.gz rust-320d049e876579cd5c57be17e791a519f9b852a0.zip | |
Add long explanation for E0722
Diffstat (limited to 'compiler/rustc_error_codes/src')
| -rw-r--r-- | compiler/rustc_error_codes/src/error_codes.rs | 2 | ||||
| -rw-r--r-- | compiler/rustc_error_codes/src/error_codes/E0722.md | 24 |
2 files changed, 25 insertions, 1 deletions
diff --git a/compiler/rustc_error_codes/src/error_codes.rs b/compiler/rustc_error_codes/src/error_codes.rs index df162f8dce0..902c7c47873 100644 --- a/compiler/rustc_error_codes/src/error_codes.rs +++ b/compiler/rustc_error_codes/src/error_codes.rs @@ -418,6 +418,7 @@ E0716: include_str!("./error_codes/E0716.md"), E0718: include_str!("./error_codes/E0718.md"), E0719: include_str!("./error_codes/E0719.md"), E0720: include_str!("./error_codes/E0720.md"), +E0722: include_str!("./error_codes/E0722.md"), E0724: include_str!("./error_codes/E0724.md"), E0725: include_str!("./error_codes/E0725.md"), E0727: include_str!("./error_codes/E0727.md"), @@ -634,7 +635,6 @@ E0783: include_str!("./error_codes/E0783.md"), E0711, // a feature has been declared with conflicting stability attributes E0717, // rustc_promotable without stability attribute // E0721, // `await` keyword - E0722, // Malformed `#[optimize]` attribute // E0723, unstable feature in `const` context E0726, // non-explicit (not `'_`) elided lifetime in unsupported position // E0738, // Removed; errored on `#[track_caller] fn`s in `extern "Rust" { ... }`. diff --git a/compiler/rustc_error_codes/src/error_codes/E0722.md b/compiler/rustc_error_codes/src/error_codes/E0722.md new file mode 100644 index 00000000000..4a687d74288 --- /dev/null +++ b/compiler/rustc_error_codes/src/error_codes/E0722.md @@ -0,0 +1,24 @@ +The `optimize` attribute was malformed. + +Erroneous code example: + +```compile_fail,E0722 +#![feature(optimize_attribute)] + +#[optimize(something)] // error: invalid argument +pub fn something() {} + +fn main() {} +``` + +The `#[optimize]` attribute should be used as follows: + +- `#[optimize(size)]` -- instructs the optimization pipeline to generate code + that's smaller rather than faster + +- `#[optimize(speed)]` -- instructs the optimization pipeline to generate code + that's faster rather than smaller + +See [RFC 2412] for more details. + +[RFC 2412]: https://rust-lang.github.io/rfcs/2412-optimize-attr.html |