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A `deprecated` attribute wasn't paired with a `stable`/`unstable` attribute with
`#![feature(staged_api)]` enabled.
Erroneous code example:
```compile_fail,E0549
#![feature(staged_api)]
#![stable(since = "1.0.0", feature = "test")]
#[deprecated(
since = "1.0.1",
note = "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")]
#[deprecated(
since = "1.0.1",
note = "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
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