src/test/ui/macros/macro-stability.stderr

   1 error[E0658]: macro unstable_macro! is unstable
   2   --> $DIR/macro-stability.rs:11:5
   3    |
   4 LL |     unstable_macro!(); //~ ERROR: macro unstable_macro! is unstable
   5    |     ^^^^^^^^^^^^^^^^^^
   6    |
   7    = help: add #![feature(unstable_macros)] 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`.