ripr 0.8.0

Find static mutation-exposure gaps before expensive mutation testing
Documentation 
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pub(crate) fn expect_value<'a>(
    args: &'a [String],
    idx: usize,
    flag: &str,
) -> Result<&'a str, String> {
    args.get(idx)
        .map(|s| s.as_str())
        .ok_or_else(|| format!("missing value for {flag}"))
}