Macro ray_dbg 

macro_rules! ray_dbg {
    () => { ... };
    ($value:expr $(,)?) => { ... };
    ($($value:expr),+ $(,)?) => { ... };
}

Debug helper that sends a value to Ray and returns it. Labels the entry with the expression string, similar to dbg!.

use ray::ray_dbg;

let value = ray_dbg!(2 + 2);
assert_eq!(value, 4);