error: use of unstable lint `im_a_teapot` --> Cargo.toml:6:1 | 6 | im_a_teapot = { level = "warn", priority = 10 } | ^^^^^^^^^^^ this is behind `test-dummy-unstable`, which is not enabled | note: `cargo::im_a_teapot` was inherited --> foo/Cargo.toml:9:1 | 9 | workspace = true | ---------------- | = help: consider adding `cargo-features = ["test-dummy-unstable"]` to the top of the manifest error: encountered 1 errors(s) while verifying lints