Concisely initializing a vector of Strings

You can use the to_string() method directly on the literals:

let test_args = vec!["-w".to_string(), "60".to_string(), "arg".to_string()];

Otherwise a macro to do this would be as simple as:

macro_rules! vec_of_strings {
    ($($x:expr),*) => (vec![$($x.to_string()),*]);
}

See play.rust.org example