| error[E0658]: frontmatters are experimental | |
| --> $DIR/feature-gate-frontmatter.rs:1:1 | |
| | | |
| LL | / ---cargo | |
| LL | | | |
| LL | | --- | |
| | |___^ | |
| | | |
| = note: see issue #136889 <https://github.com/rust-lang/rust/issues/136889> for more information | |
| = help: add `#![feature(frontmatter)]` 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| = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date | |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`. |