warning: called `expect` on `config` after checking its variant with `is_none` --> src/commands.rs:48:29 | 44 | let opt = if opt.format.is_some() || config.is_none() { | ---------------- the check is happening here ... 48 | format: config.expect("Here we know that it is some").print_format, | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = help: try using `if let` or `match` = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_unwrap = note: `#[warn(clippy::unnecessary_unwrap)]` on by default