Change Details

1. `arc lint` displays two errors, one for the spaces after `struct`, and one for the comment being too long. 2. `cargo fmt` prints warnings for unstable lints, and running `arc lint` will have only the comment error. 3. `cargo +nightly fmt` runs silently, and running `arc lint` will have no errors.

`cargo +nightly fmt` runs silently, and running `arc lint` will have no errors.

1. `arc lint` displays two errors, one for the spaces after `struct`, and one for the comment being too long. 2. `cargo fmt` prints warnings for unstable lints, and running `arc lint` will have only the comment error. 3. `cargo +nightly fmt` runs silently, and running `arc lint` will have no errors.