Macro develop_debug::develop_debug

macro_rules! develop_debug {
    (title $($msg:expr),*) => { ... };
    (step $($msg:expr),*) => { ... };
    (var $($arg:expr),*) => { ... };
    (iter $($list:expr),*) => { ... };
    (done $($msg:expr),*) => { ... };
    (error $($msg:expr),*) => { ... };
    ($($args:tt)*) => { ... };
}

Print debugging information at development time.

See the manual