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