1 error[E0658]: attributes on expressions are experimental
2 --> $DIR/feature-gate-stmt_expr_attributes.rs:1:16
4 LL | const X: i32 = #[allow(dead_code)] 8;
7 = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
8 = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0658`.