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+The `feature` value is missing in a stability attribute.
+
+Erroneous code example:
+
+```compile_fail,E0546
+#![feature(staged_api)]
+#![stable(since = "1.0.0", feature = "test")]
+
+#[unstable(issue = "none")] // invalid
+fn unstable_fn() {}
+
+#[stable(since = "1.0.0")] // invalid
+fn stable_fn() {}
+```
+
+To fix this issue, you need to provide the `feature` field. Example:
+
+```
+#![feature(staged_api)]
+#![stable(since = "1.0.0", feature = "test")]
+
+#[unstable(feature = "unstable_fn", issue = "none")] // ok!
+fn unstable_fn() {}
+
+#[stable(feature = "stable_fn", since = "1.0.0")] // ok!
+fn stable_fn() {}
+```
+
+See the [How Rust is Made and “Nightly Rust”][how-rust-made-nightly] appendix
+of the Book and the [Stability attributes][stability-attributes] section of the
+Rustc Dev Guide for more details.
+
+[how-rust-made-nightly]: https://doc.rust-lang.org/book/appendix-07-nightly-rust.html
+[stability-attributes]: https://rustc-dev-guide.rust-lang.org/stability.html