Rust errors / Attributes, macros and features
Rust compiler error · checked with rustc 1.99.0
Rust error E0554: `#![feature]` may not be used on the stable release channel
What it meansFeature attributes are only allowed on the nightly release channel. Stable or beta compilers will not comply.
What rustc prints
error[E0554]: `#![feature]` may not be used on the stable release channel
--> main.rs:1:1
|
1 | #![feature(lang_items)] // error: `#![feature]` may not be used on the
| ^^^^^^^^^^^^^^^^^^^^^^^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
Feature attributes are only allowed on the nightly release channel. Stable or beta compilers will not comply.
Erroneous code example:
#![feature(lang_items)] // error: `#![feature]` may not be used on the
// stable release channelIf you need the feature, make sure to use a nightly release of the compiler (but be warned that the feature may be removed or altered in the future).
From rustc --explain E0554 (1.99.0), part of the Rust project, MIT or Apache-2.0. Official page.
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