There is currently a missing middle ground in stable Rust, which is to lint on a missing variant rather than fail compilation. There's an unstable option for it

There is currently a missing middle ground in stable Rust, which is to lint on a missing variant rather than fail compilation. There's an unstable option for it, but it would be very useful for non-exhaustive enums where consumers care about matching against every known variant. You can practically use it today by gating on a nightly-only cfg flag. See https://github.com/guppy-rs/guppy/blob/fa61210b67bea233de52c10395045bc19c62b068/.cargo/nightly-config.toml#L11 https://github.com/guppy-rs/guppy/blob/fa61210b67bea233de52c... and https://github.com/guppy-rs/guppy/blob/fa61210b67bea233de52c10395045bc19c62b068/tools/hakari/src/cli_ops/initialize.rs#L63 https://github.com/guppy-rs/guppy/blob/fa61210b67bea233de52c...