Macro concat_with::concat_line

macro_rules! concat_line {
    ($($e:expr),* $(,)*) => { ... };
    (prefix $p:expr $(, $e:expr)* $(,)*) => { ... };
    (suffix $s:expr $(, $e:expr)* $(,)*) => { ... };
    (prefix $p:expr, suffix $s:expr $(, $e:expr)* $(,)*) => { ... };
    (suffix $s:expr, prefix $p:expr $(, $e:expr)* $(,)*) => { ... };
}

Concatenates literals into a static string slice separated by a line break, \n. Prefixes and suffixes can also be added.

assert_eq!("test\n10\nb\ntrue", concat_with::concat_line!("test", 10, 'b', true));

*/