warning: unknown lint: `non_exhaustive_omitted_patterns`
  --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:3:1
   |
LL | #![deny(non_exhaustive_omitted_patterns)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(unknown_lints)]` on by default
   = note: the `non_exhaustive_omitted_patterns` lint is unstable
   = note: see issue #89554 <https://github.com/rust-lang/rust/issues/89554> for more information
   = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable

warning: unknown lint: `non_exhaustive_omitted_patterns`
  --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:6:1
   |
LL | #![allow(non_exhaustive_omitted_patterns)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: the `non_exhaustive_omitted_patterns` lint is unstable
   = note: see issue #89554 <https://github.com/rust-lang/rust/issues/89554> for more information
   = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable

warning: unknown lint: `non_exhaustive_omitted_patterns`
  --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:15:5
   |
LL |     #[allow(non_exhaustive_omitted_patterns)]
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: the `non_exhaustive_omitted_patterns` lint is unstable
   = note: see issue #89554 <https://github.com/rust-lang/rust/issues/89554> for more information
   = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable

warning: unknown lint: `non_exhaustive_omitted_patterns`
  --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:15:5
   |
LL |     #[allow(non_exhaustive_omitted_patterns)]
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: the `non_exhaustive_omitted_patterns` lint is unstable
   = note: see issue #89554 <https://github.com/rust-lang/rust/issues/89554> for more information
   = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable

warning: unknown lint: `non_exhaustive_omitted_patterns`
  --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:29:9
   |
LL |         #[warn(non_exhaustive_omitted_patterns)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: the `non_exhaustive_omitted_patterns` lint is unstable
   = note: see issue #89554 <https://github.com/rust-lang/rust/issues/89554> for more information
   = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable

warning: unknown lint: `non_exhaustive_omitted_patterns`
  --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:3:1
   |
LL | #![deny(non_exhaustive_omitted_patterns)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: the `non_exhaustive_omitted_patterns` lint is unstable
   = note: see issue #89554 <https://github.com/rust-lang/rust/issues/89554> for more information
   = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable

warning: unknown lint: `non_exhaustive_omitted_patterns`
  --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:6:1
   |
LL | #![allow(non_exhaustive_omitted_patterns)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: the `non_exhaustive_omitted_patterns` lint is unstable
   = note: see issue #89554 <https://github.com/rust-lang/rust/issues/89554> for more information
   = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable

warning: unknown lint: `non_exhaustive_omitted_patterns`
  --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:15:5
   |
LL |     #[allow(non_exhaustive_omitted_patterns)]
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: the `non_exhaustive_omitted_patterns` lint is unstable
   = note: see issue #89554 <https://github.com/rust-lang/rust/issues/89554> for more information
   = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable

warning: unknown lint: `non_exhaustive_omitted_patterns`
  --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:15:5
   |
LL |     #[allow(non_exhaustive_omitted_patterns)]
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: the `non_exhaustive_omitted_patterns` lint is unstable
   = note: see issue #89554 <https://github.com/rust-lang/rust/issues/89554> for more information
   = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable

warning: unknown lint: `non_exhaustive_omitted_patterns`
  --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:29:9
   |
LL |         #[warn(non_exhaustive_omitted_patterns)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: the `non_exhaustive_omitted_patterns` lint is unstable
   = note: see issue #89554 <https://github.com/rust-lang/rust/issues/89554> for more information
   = help: add `#![feature(non_exhaustive_omitted_patterns_lint)]` to the crate attributes to enable

error[E0004]: non-exhaustive patterns: `C` not covered
  --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:20:11
   |
LL |     match Foo::A {
   |           ^^^^^^ pattern `C` not covered
   |
note: `Foo` defined here
  --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:12:15
   |
LL |     enum Foo {
   |          ---
LL |         A, B, C,
   |               ^ not covered
   = note: the matched value is of type `Foo`
help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern or an explicit pattern as shown
   |
LL ~         Foo::B => {}
LL +         C => todo!()
   |

error: aborting due to previous error; 10 warnings emitted

For more information about this error, try `rustc --explain E0004`.