src/test/ui/feature-gates/unknown-feature.stderr

   1 error[E0635]: unknown feature `unknown_rust_feature`
   2   --> $DIR/unknown-feature.rs:1:12
   3    |
   4 LL | #![feature(unknown_rust_feature)]
   5    |            ^^^^^^^^^^^^^^^^^^^^
   6
   7 error: aborting due to previous error
   8
   9 For more information about this error, try `rustc --explain E0635`.