| error[E0658]: use of unstable library feature 'issue_52489_unstable' | |
| --> $DIR/issue-52489.rs:5:5 | |
| | | |
| LL | use issue_52489; | |
| | ^^^^^^^^^^^ | |
| | | |
| = help: add `#![feature(issue_52489_unstable)]` to the crate attributes to enable | |
| = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0658`. |