Function check_failure_regexes 

pub fn check_failure_regexes(
    line: Result<String>,
    failure_regexes: &RegexSet,
    ignore_regexes: &RegexSet,
    cmd: &str,
    bypass_test_capture: bool,
) -> Result<String>

Checks command output log line from cmd against a failure_regexes regex set, and returns an error if any regex matches. The line is skipped if it matches ignore_regexes.

Passes through errors from the underlying reader.