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Rollup merge of #81835 - jesusprubio:improve-long-eplanation-e0546, r=GuillaumeGomez

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Improve long explanation for E0546

Helps with #61137
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Guillaume Gomez 2021-02-07 14:45:54 +01:00 committed by GitHub
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compiler/rustc_error_codes/src/error_codes/E0546.md
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@ -1,4 +1,4 @@
A feature name is missing.
The `feature` value is missing in a stability attribute.
Erroneous code example:
@ -13,7 +13,7 @@ fn unstable_fn() {}
fn stable_fn() {}
```
To fix the issue you need to provide a feature name.
To fix the issue you need to provide the `feature` field.
```
#![feature(staged_api)]
@ -25,3 +25,10 @@ fn unstable_fn() {}
#[stable(feature = "stable_fn", since = "1.0.0")] // ok!
fn stable_fn() {}
```
See the [How Rust is Made and “Nightly Rust”][how-rust-made-nightly] appendix
of the Book and the [Stability attributes][stability-attributes] section of the
Rustc Dev Guide for more details.
[how-rust-made-nightly]: https://doc.rust-lang.org/book/appendix-07-nightly-rust.html
[stability-attributes]: https://rustc-dev-guide.rust-lang.org/stability.html