Error code E0546

The feature value is missing in a stability attribute.

Erroneous code example:

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

#[unstable(issue = "none")] // invalid
fn unstable_fn() {}

#[stable(since = "1.0.0")] // invalid
fn stable_fn() {}

Run

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

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

#[unstable(feature = "unstable_fn", issue = "none")] // ok!
fn unstable_fn() {}

#[stable(feature = "stable_fn", since = "1.0.0")] // ok!
fn stable_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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