Rust errors / Names, paths and imports
Rust compiler error · checked with rustc 1.99.0
Rust error E0544: multiple stability levels
What it meansMultiple stability attributes were declared on the same item.
What rustc prints
error[E0544]: multiple stability levels
--> main.rs:6:1
|
6 | #[stable(feature = "test", since = "2.0.0")] // invalid
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^Real output of rustc 1.99.0 compiling the official example below (2021 edition). Your names and line numbers will differ; the first line is the part to match.
The compiler team's explanation
Multiple stability attributes were declared on the same item.
Erroneous code example:
#![feature(staged_api)]
#![allow(internal_features)]
#![stable(since = "1.0.0", feature = "rust1")]
#[stable(feature = "rust1", since = "1.0.0")]
#[stable(feature = "test", since = "2.0.0")] // invalid
fn foo() {}To fix this issue, ensure that each item has at most one stability attribute.
#![feature(staged_api)]
#![allow(internal_features)]
#![stable(since = "1.0.0", feature = "rust1")]
#[stable(feature = "test", since = "2.0.0")] // ok!
fn foo() {}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.
From rustc --explain E0544 (1.99.0), part of the Rust project, MIT or Apache-2.0. Official page.
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