| error[E0658]: use of unstable library feature 'concat_idents': `concat_idents` is not stable enough for use and is subject to change |
| --> $DIR/feature-gate-concat_idents.rs:5:13 |
| | |
| LL | let a = concat_idents!(X, Y_1); |
| | ^^^^^^^^^^^^^ |
| | |
| = note: for more information, see https://github.com/rust-lang/rust/issues/29599 |
| = help: add `#![feature(concat_idents)]` to the crate attributes to enable |
| |
| error[E0658]: use of unstable library feature 'concat_idents': `concat_idents` is not stable enough for use and is subject to change |
| --> $DIR/feature-gate-concat_idents.rs:6:13 |
| | |
| LL | let b = concat_idents!(X, Y_2); |
| | ^^^^^^^^^^^^^ |
| | |
| = note: for more information, see https://github.com/rust-lang/rust/issues/29599 |
| = help: add `#![feature(concat_idents)]` to the crate attributes to enable |
| |
| error: aborting due to 2 previous errors |
| |
| For more information about this error, try `rustc --explain E0658`. |