src/test/ui/cfg-attr-crate-2.stderr

   1 error[E0658]: no_core is experimental (see issue #29639)
   2   --> $DIR/cfg-attr-crate-2.rs:15:21
   3    |
   4 LL | #![cfg_attr(broken, no_core)] //~ ERROR no_core is experimental
   5    |                     ^^^^^^^^
   6    |
   7    = help: add #![feature(no_core)] to the crate attributes to enable
   8
   9 error: aborting due to previous error
  10
  11 For more information about this error, try `rustc --explain E0658`.