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
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
   = note: `#[warn(unknown_lints)]` on by default

warning: unknown lint: `non_exhaustive_omitted_patterns`
  --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:5:1
   |
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
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

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
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

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
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

warning: unknown lint: `non_exhaustive_omitted_patterns`
  --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:24:5
   |
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
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

warning: unknown lint: `non_exhaustive_omitted_patterns`
  --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:24:5
   |
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
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error[E0004]: non-exhaustive patterns: `Foo::C` not covered
  --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:18:11
   |
LL |     match Foo::A {
   |           ^^^^^^ pattern `Foo::C` not covered
   |
note: `Foo` defined here
  --> $DIR/feature-gate-non_exhaustive_omitted_patterns_lint.rs:9:10
   |
LL |     enum Foo {
   |          ^^^
...
LL |         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 +         Foo::C => todo!()
   |

error: aborting due to 1 previous error; 6 warnings emitted

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