Error code E0543

The note value is missing in a stability attribute.

Erroneous code example:

#![feature(staged_api)]
#![stable(since = "1.0.0", feature = "test")]

#[stable(since = "0.1.0", feature = "_deprecated_fn")]
#[deprecated(
    since = "1.0.0"
)] // invalid
fn _deprecated_fn() {}

Run

To fix this issue, you need to provide the note field. Example:

#![feature(staged_api)]
#![stable(since = "1.0.0", feature = "test")]

#[stable(since = "0.1.0", feature = "_deprecated_fn")]
#[deprecated(
    since = "1.0.0",
    note = "explanation for deprecation"
)] // ok!
fn _deprecated_fn() {}

Run

See the How Rust is Made and “Nightly Rust” appendix of the Book and the Stability attributes section of the Rustc Dev Guide for more details.

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