| error[E0658]: `macro` is experimental | |
| --> $DIR/feature-gate-decl_macro.rs:3:1 | |
| | | |
| LL | macro m() {} | |
| | ^^^^^^^^^^^^ | |
| | | |
| = note: see issue #39412 <https://github.com/rust-lang/rust/issues/39412> for more information | |
| = help: add `#![feature(decl_macro)]` 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| = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date | |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`. |