Error code E0705

Note: this error code is no longer emitted by the compiler.

A #![feature] attribute was used for a feature that is stable in the current edition, but not in all editions.

Erroneous code example:

#![allow(unused)] #![feature(rust_2018_preview)] #![feature(test_2018_feature)] // error: the feature fn main() { // `test_2018_feature` is // included in the Rust 2018 edition }