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Rollup merge of #82246 - jesusprubio:add-long-explanation-e0549, r=GuillaumeGomez

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Add long explanation for E0549

Helps with #61137
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Dylan DPC 2021-02-18 16:57:41 +01:00 • committed by GitHub
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4
compiler/rustc_error_codes/src/error_codes.rs
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@ -290,6 +290,7 @@ E0543: include_str!("./error_codes/E0543.md"),
E0545: include_str!("./error_codes/E0545.md"),
E0546: include_str!("./error_codes/E0546.md"),
E0547: include_str!("./error_codes/E0547.md"),
E0549: include_str!("./error_codes/E0549.md"),
E0550: include_str!("./error_codes/E0550.md"),
E0551: include_str!("./error_codes/E0551.md"),
E0552: include_str!("./error_codes/E0552.md"),
@ -608,9 +609,6 @@ E0781: include_str!("./error_codes/E0781.md"),
// E0540, // multiple rustc_deprecated attributes
E0544, // multiple stability levels
// E0548, // replaced with a generic attribute input check
// rustc_deprecated attribute must be paired with either stable or unstable
// attribute
E0549,
E0553, // multiple rustc_const_unstable attributes
// E0555, // replaced with a generic attribute input check
// E0558, // replaced with a generic attribute input check

37
compiler/rustc_error_codes/src/error_codes/E0549.md Normal file
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@ -0,0 +1,37 @@
A `rustc_deprecated` attribute wasn't paired with a `stable`/`unstable`
attribute.
Erroneous code example:
```compile_fail,E0549
#![feature(staged_api)]
#![stable(since = "1.0.0", feature = "test")]
#[rustc_deprecated(
since = "1.0.1",
reason = "explanation for deprecation"
)] // invalid
fn _deprecated_fn() {}
```
To fix this issue, you need to add also an attribute `stable` or `unstable`.
Example:
```
#![feature(staged_api)]
#![stable(since = "1.0.0", feature = "test")]
#[stable(since = "1.0.0", feature = "test")]
#[rustc_deprecated(
since = "1.0.1",
reason = "explanation for deprecation"
)] // ok!
fn _deprecated_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

2
src/test/ui/stability-attribute/stability-attribute-sanity.stderr
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@ -116,5 +116,5 @@ LL | #[rustc_deprecated(since = "a", reason = "text")]
error: aborting due to 19 previous errors
Some errors have detailed explanations: E0539, E0541, E0542, E0543, E0546, E0547, E0550.
Some errors have detailed explanations: E0539, E0541, E0542, E0543, E0546, E0547, E0549, E0550.
For more information about an error, try `rustc --explain E0539`.