Macro info 

macro_rules! info {
    ($($arg:tt)*) => { ... };
}

Info log

#[macro_use] extern crate logkit;

info!(); // outputs just a linebreak
info!("plain message");
info!("println-like message {} {}!", "Hello", "World");
info!(name = "Alice", age = 20); // outputs only fields, no message
info!(name = "Alice", age = 20; "separate fields and messages with semicolon");
info!(name = "Alice", age = 20; "println-like message {} {}! with fields", "Hello", "World");