battery 0.7.8

#[macro_export]
macro_rules! r#kern_try {
    ($expr:expr) => {
        match $expr {
            mach::kern_return::KERN_SUCCESS => (),
            err_code => return ::std::result::Result::Err(::std::io::Error::from_raw_os_error(err_code).into()),
        }
    };
    ($expr:expr,) => {
        r#kern_try!($expr)
    };
}