src/test/ui/extern/extern-prelude-core.stderr

   1 warning: the feature `extern_prelude` has been stable since 1.30.0 and no longer requires an attribute to enable
   2   --> $DIR/extern-prelude-core.rs:2:12
   3    |
   4 LL | #![feature(extern_prelude, lang_items, start)]
   5    |            ^^^^^^^^^^^^^^
   6    |
   7    = note: `#[warn(stable_features)]` on by default
   8