gistfile1.rs

mod a {            
  pub type b = int;
}                  
mod b {            
  use a;    // bad 
  use a::b; // good
}                  
                   

gistfile2.rs

mod a {                       
    pub mod b {               
        pub type c = int;     
    }                         
}                             
                              
mod b {                       
    use a::b;                 
                              
    pub use c = b::c;          // bad
    fn f() -> b::c { fail!() } // good
}