| error[E0658]: use of unstable library feature 'unicode_internals' | |
| --> $DIR/accidental-stable-in-unstable.rs:6:5 | |
| | | |
| LL | use core::unicode::UNICODE_VERSION; | |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | |
| | | |
| = help: add `#![feature(unicode_internals)]` to the crate attributes to enable | |
| error: aborting due to previous error | |
| For more information about this error, try `rustc --explain E0658`. |