File: E0705.md

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rustc 1.70.0%2Bdfsg1-9
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A `#![feature]` attribute was declared for a feature that is stable in the
current edition, but not in all editions.

Erroneous code example:

```rust2018,compile_fail,E0705
#![feature(rust_2018_preview)]
#![feature(test_2018_feature)] // error: the feature
                               // `test_2018_feature` is
                               // included in the Rust 2018 edition
```