src/test/ui/feature-gate-stmt_expr_attributes.stderr

   1 error: attributes on non-item statements and expressions are experimental. (see issue #15701)
   2   --> $DIR/feature-gate-stmt_expr_attributes.rs:11:16
   3    |
   4 11 | const X: i32 = #[allow(dead_code)] 8;
   5    |                ^^^^^^^^^^^^^^^^^^^
   6    |
   7    = help: add #![feature(stmt_expr_attributes)] to the crate attributes to enable
   8
   9 error: aborting due to previous error
  10