println!("called `my_mod::private_nested::function()`");

}

// Private parent items will still restrict the visibility of a child item,

// even if it is declared as visible within a bigger scope.

#[allow(dead_code)]

pub(crate) fn restricted_function() {

println!("called `my_mod::private_nested::restricted_function()`");

}

}

}

fn function() {

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

}

fn main() {

// Modules allow disambiguation between items that have the same name.

function();

my_mod::function();

// Public items, including those inside nested modules, can be

// accessed from outside the parent module.

my_mod::indirect_access();

my_mod::nested::function();

my_mod::call_public_function_in_my_mod();

// pub(crate) items can be called from anywhere in the same crate

my_mod::public_function_in_crate();

// pub(in path) items can only be called from within the module specified

// Error! function `public_function_in_my_mod` is private

//my_mod::nested::public_function_in_my_mod();

// TODO ^ Try uncommenting this line

// Private items of a module cannot be directly accessed, even if

// nested in a public module:

// Error! `private_function` is private

//my_mod::private_function();

// TODO ^ Try uncommenting this line

// Error! `private_function` is private

//my_mod::nested::private_function();

// TODO ^ Try uncommenting this line

// Error! `private_nested` is a private module

//my_mod::private_nested::function();

// TODO ^ Try uncommenting this line

// Error! `private_nested` is a private module

//my_mod::private_nested::restricted_function();

// TODO ^ Try uncommenting this line

}

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Struct visibility

Structs have an extra level of visibility with their fields. The visibility defaults to private, and can be overridden with the pub modifier. This visibility only matters when a struct is accessed from outside the module where it is defined, and has the goal of hiding information (encapsulation).

mod my {

// A public struct with a public field of generic type `T`

pub struct OpenBox {

pub contents: T,

}

// A public struct with a private field of generic type `T`

#[allow(dead_code)]

pub struct ClosedBox {

contents: T,

}

impl ClosedBox {

// A public constructor method