1 error[E0658]: use of unstable library feature 'unstable_test_feature'
2 --> $DIR/issue-28388-3.rs:7:5
4 LL | use lint_stability::UnstableEnum::{};
5 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
7 = help: add `#![feature(unstable_test_feature)]` to the crate attributes to enable
9 error: aborting due to previous error
11 For more information about this error, try `rustc --explain E0658`.