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1 The `issue` value is incorrect in a stability attribute.
2
3 Erroneous code example:
4
5 ```compile_fail,E0545
6 #![feature(staged_api)]
7 #![stable(since = "1.0.0", feature = "test")]
8
9 #[unstable(feature = "_unstable_fn", issue = "0")] // invalid
10 fn _unstable_fn() {}
11
12 #[rustc_const_unstable(feature = "_unstable_const_fn", issue = "0")] // invalid
13 fn _unstable_const_fn() {}
14 ```
15
16 To fix this issue, you need to provide a correct value in the `issue` field.
17 Example:
18
19 ```
20 #![feature(staged_api)]
21 #![stable(since = "1.0.0", feature = "test")]
22
23 #[unstable(feature = "_unstable_fn", issue = "none")] // ok!
24 fn _unstable_fn() {}
25
26 #[rustc_const_unstable(feature = "_unstable_const_fn", issue = "1")] // ok!
27 fn _unstable_const_fn() {}
28 ```
29
30 See the [How Rust is Made and “Nightly Rust”][how-rust-made-nightly] appendix
31 of the Book and the [Stability attributes][stability-attributes] section of the
32 Rustc Dev Guide for more details.
33
34 [how-rust-made-nightly]: https://doc.rust-lang.org/book/appendix-07-nightly-rust.html
35 [stability-attributes]: https://rustc-dev-guide.rust-lang.org/stability.html