| 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 | |
| error: aborting due to previous error | |
| For more information about this error, try `rustc --explain E0658`. |