Co-authored-by: Adrian <adrian.iosdev@gmail.com>
implies_by
rustc_const_unstable
Extend support for `implies_by` (from `#[stable]` and `#[unstable]`) to `#[rustc_const_stable]` and `#[rustc_const_unstable]`. Signed-off-by: David Wood <david.wood@huawei.com>