Macro dbg_print 

macro_rules! dbg_print {
    ($($message:expr),*) => { ... };
}

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BASIC print, println, eprint, eprintln functions

Prints to the standard ouput only in debug build.
In release build this macro is not compiled thanks to #[cfg(debug_assertions)].
see https://doc.rust-lang.org/std/macro.print.html for more info.