Macro using 

macro_rules! using {
    ($($v:vis $p:ident),* $(,)?) => { ... };
}

Declares a mod and uses it.

Examples

using!{
  pub mod1,
  pub(crate) mod2,
  mod3
}

Expands to:

mod mod1;
pub use self::mod1::*;
mod mod2;
pub(crate) use self::mod2::*;
mod mod3;
use self::name::*;