warning: unknown lint: `must_not_suspend`
  --> $DIR/gated.rs:4:1
   |
LL | #![deny(must_not_suspend)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(unknown_lints)]` on by default
   = note: the `must_not_suspend` lint is unstable
   = note: see issue #83310 <https://github.com/rust-lang/rust/issues/83310> for more information
   = help: add `#![feature(must_not_suspend)]` to the crate attributes to enable

warning: unknown lint: `must_not_suspend`
  --> $DIR/gated.rs:4:1
   |
LL | #![deny(must_not_suspend)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: the `must_not_suspend` lint is unstable
   = note: see issue #83310 <https://github.com/rust-lang/rust/issues/83310> for more information
   = help: add `#![feature(must_not_suspend)]` to the crate attributes to enable

warning: unknown lint: `must_not_suspend`
  --> $DIR/gated.rs:4:1
   |
LL | #![deny(must_not_suspend)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: the `must_not_suspend` lint is unstable
   = note: see issue #83310 <https://github.com/rust-lang/rust/issues/83310> for more information
   = help: add `#![feature(must_not_suspend)]` to the crate attributes to enable

warning: 3 warnings emitted