Use Declarations in Rust Programming

Rust ProgrammingServer Side ProgrammingProgramming

Use Declarations in Rust are used to bind a full path to a new name. It can be very helpful in cases where the full path is a bit long to write and invoke.

In normal cases, we were used to doing something like this:

use crate::deeply::nested::{

fn main() {

We invoked the use declaration function by the name of the function my_function. Use declaration also allows us to bind the full path to a new name of our choice.


Consider the example shown below:

// Bind the `deeply::nested::function` path to `my_function`.
use deeply::nested::function as my_function;

fn function() {
   println!("called `function()`");

mod deeply {
   pub mod nested {
      pub fn function() {
         println!("called `deeply::nested::function()`");
fn main() {
   // Easier access to `deeply::nested::function`

   println!("Entering block");
      // This is equivalent to `use deeply::nested::function as function`.
      // This `function()` will shadow the outer one.
      use crate::deeply::nested::function;

      // `use` bindings have a local scope. In this case, the
      // shadowing of `function()` is only in this block.
      println!("Exiting block");


called `deeply::nested::function()`
Entering block
called `deeply::nested::function()`
Exiting block
called `function()
Published on 05-Apr-2021 07:49:21