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Rollup merge of rust-lang#71808 - unexge:long-err-expl-for-e0539, r=G…
…uillaumeGomez Add long error explanation for E0539 since this error is similar to [E0551](https://github.com/rust-lang/rust/blob/master/src/librustc_error_codes/error_codes/E0551.md) most of the content was copied from it. part of rust-lang#61137.
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Original file line number | Diff line number | Diff line change |
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An invalid meta-item was used inside an attribute. | ||
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Erroneous code example: | ||
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```compile_fail,E0539 | ||
#![feature(staged_api)] | ||
#![stable(since = "1.0.0", feature = "test")] | ||
#[rustc_deprecated(reason)] // error! | ||
#[unstable(feature = "deprecated_fn", issue = "123")] | ||
fn deprecated() {} | ||
#[unstable(feature = "unstable_struct", issue)] // error! | ||
struct Unstable; | ||
#[rustc_const_unstable(feature)] // error! | ||
const fn unstable_fn() {} | ||
#[stable(feature = "stable_struct", since)] // error! | ||
struct Stable; | ||
#[rustc_const_stable(feature)] // error! | ||
const fn stable_fn() {} | ||
``` | ||
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Meta items are the key-value pairs inside of an attribute. | ||
To fix these issues you need to give required key-value pairs. | ||
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``` | ||
#![feature(staged_api)] | ||
#![stable(since = "1.0.0", feature = "test")] | ||
#[rustc_deprecated(since = "1.39.0", reason = "reason")] // ok! | ||
#[unstable(feature = "deprecated_fn", issue = "123")] | ||
fn deprecated() {} | ||
#[unstable(feature = "unstable_struct", issue = "123")] // ok! | ||
struct Unstable; | ||
#[rustc_const_unstable(feature = "unstable_fn", issue = "124")] // ok! | ||
const fn unstable_fn() {} | ||
#[stable(feature = "stable_struct", since = "1.39.0")] // ok! | ||
struct Stable; | ||
#[rustc_const_stable(feature = "stable_fn", since = "1.39.0")] // ok! | ||
const fn stable_fn() {} | ||
``` |
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