1 error[E0658]: attributes on non-item statements and expressions are experimental. (see issue #15701)
2 --> $DIR/feature-gate-stmt_expr_attributes.rs:11:16
4 11 | const X: i32 = #[allow(dead_code)] 8;
7 = help: add #![feature(stmt_expr_attributes)] to the crate attributes to enable
9 error: aborting due to previous error