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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
+```