Function run 

pub fn run<O: Write, E: Write>(
    args: &Args,
    out: &mut O,
    err: &mut E,
) -> Result<u8>

Run the validation described by args, writing results to out and diagnostics to err. Returns the process exit code.

Errors

Returns an error only if writing to out itself fails; per-input failures are reported via err and reflected in the returned exit code.