src/test/ui/stability-attribute/generics-default-stability-where.stderr

   1 error[E0658]: use of unstable library feature 'unstable_default'
   2   --> $DIR/generics-default-stability-where.rs:7:45
   3    |
   4 LL | impl<T> Trait3<usize> for T where T: Trait2<usize> {
   5    |                                             ^^^^^
   6    |
   7    = help: add `#![feature(unstable_default)]` 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`.