| error[E0658]: use of unstable library feature 'concat_bytes' |
| --> $DIR/feature-gate-concat_bytes.rs:2:13 |
| | |
| LL | let a = concat_bytes!(b'A', b"BC"); |
| | ^^^^^^^^^^^^ |
| | |
| = note: see issue #87555 <https://github.com/rust-lang/rust/issues/87555> for more information |
| = help: add `#![feature(concat_bytes)]` 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| = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date |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`. |
