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83

13

By following this guide I created a Cargo project.

src/main.rs

fn main() 
 hello::print_hello();


mod hello 
 pub fn print_hello() 
 println!("Hello, world!");
 

which I run using

cargo build && cargo run

and it compiles without errors. Now I'm trying to split the main module in two but cannot figure out how to include a module from another file.

My project tree looks like this

├── src
    ├── hello.rs
    └── main.rs

and the content of the files:

src/main.rs

use hello;

fn main() 
 hello::print_hello();

src/hello.rs

mod hello 
 pub fn print_hello() 
 println!("Hello, world!");
 

When I compile it with cargo build I get

error[E0432]: unresolved import `hello`
 --> src/main.rs:1:5
 |
1 | use hello;
 | ^^^^^ no `hello` external crate

I tried to follow the compiler's suggestions and modified main.rs to:

#![feature(globs)]

extern crate hello;

use hello::*;

fn main() 
 hello::print_hello();

But this still doesn't help much, now I get this:

error[E0463]: can't find crate for `hello`
 --> src/main.rs:3:1
 |
3 | extern crate hello;
 | ^^^^^^^^^^^^^^^^^^^ can't find crate

Is there a trivial example of how to include one module from the current project into the project's main file?

Also, I'm running Rust 1.37.0.

rust

share|improve this question

edited Aug 25 at 14:38

Lukas Kalbertodt

32.3k55 gold badges8181 silver badges146146 bronze badges

asked Oct 15 '14 at 17:47

aveave

4,91355 gold badges1919 silver badges3232 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  possible duplicate of Rust basic imports (includes)
  
  – Levans
  Oct 15 '14 at 18:52
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Related to stackoverflow.com/questions/22596920/…
  
  – Kelvin
  Jul 31 '15 at 15:50
  

  
  
  
  

add a comment | 

83

13

By following this guide I created a Cargo project.

src/main.rs

fn main() 
 hello::print_hello();


mod hello 
 pub fn print_hello() 
 println!("Hello, world!");
 

which I run using

cargo build && cargo run

and it compiles without errors. Now I'm trying to split the main module in two but cannot figure out how to include a module from another file.

My project tree looks like this

├── src
    ├── hello.rs
    └── main.rs

and the content of the files:

src/main.rs

use hello;

fn main() 
 hello::print_hello();

src/hello.rs

mod hello 
 pub fn print_hello() 
 println!("Hello, world!");
 

When I compile it with cargo build I get

error[E0432]: unresolved import `hello`
 --> src/main.rs:1:5
 |
1 | use hello;
 | ^^^^^ no `hello` external crate

I tried to follow the compiler's suggestions and modified main.rs to:

#![feature(globs)]

extern crate hello;

use hello::*;

fn main() 
 hello::print_hello();

But this still doesn't help much, now I get this:

error[E0463]: can't find crate for `hello`
 --> src/main.rs:3:1
 |
3 | extern crate hello;
 | ^^^^^^^^^^^^^^^^^^^ can't find crate

Is there a trivial example of how to include one module from the current project into the project's main file?

Also, I'm running Rust 1.37.0.

rust

share|improve this question

edited Aug 25 at 14:38

Lukas Kalbertodt

32.3k55 gold badges8181 silver badges146146 bronze badges

asked Oct 15 '14 at 17:47

aveave

4,91355 gold badges1919 silver badges3232 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  possible duplicate of Rust basic imports (includes)
  
  – Levans
  Oct 15 '14 at 18:52
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Related to stackoverflow.com/questions/22596920/…
  
  – Kelvin
  Jul 31 '15 at 15:50
  

  
  
  
  

add a comment | 

By following this guide I created a Cargo project.

src/main.rs

fn main() 
 hello::print_hello();


mod hello 
 pub fn print_hello() 
 println!("Hello, world!");
 

which I run using

cargo build && cargo run

and it compiles without errors. Now I'm trying to split the main module in two but cannot figure out how to include a module from another file.

My project tree looks like this

├── src
    ├── hello.rs
    └── main.rs

and the content of the files:

src/main.rs

use hello;

fn main() 
 hello::print_hello();

src/hello.rs

mod hello 
 pub fn print_hello() 
 println!("Hello, world!");
 

When I compile it with cargo build I get

error[E0432]: unresolved import `hello`
 --> src/main.rs:1:5
 |
1 | use hello;
 | ^^^^^ no `hello` external crate

I tried to follow the compiler's suggestions and modified main.rs to:

#![feature(globs)]

extern crate hello;

use hello::*;

fn main() 
 hello::print_hello();

But this still doesn't help much, now I get this:

error[E0463]: can't find crate for `hello`
 --> src/main.rs:3:1
 |
3 | extern crate hello;
 | ^^^^^^^^^^^^^^^^^^^ can't find crate

Is there a trivial example of how to include one module from the current project into the project's main file?

Also, I'm running Rust 1.37.0.

rust

share|improve this question

edited Aug 25 at 14:38

Lukas Kalbertodt

32.3k55 gold badges8181 silver badges146146 bronze badges

asked Oct 15 '14 at 17:47

aveave

4,91355 gold badges1919 silver badges3232 bronze badges

fn main() 
 hello::print_hello();


mod hello 
 pub fn print_hello() 
 println!("Hello, world!");
 

cargo build && cargo run

├── src
    ├── hello.rs
    └── main.rs

use hello;

fn main() 
 hello::print_hello();

mod hello 
 pub fn print_hello() 
 println!("Hello, world!");
 

error[E0432]: unresolved import `hello`
 --> src/main.rs:1:5
 |
1 | use hello;
 | ^^^^^ no `hello` external crate

#![feature(globs)]

extern crate hello;

use hello::*;

fn main() 
 hello::print_hello();

error[E0463]: can't find crate for `hello`
 --> src/main.rs:3:1
 |
3 | extern crate hello;
 | ^^^^^^^^^^^^^^^^^^^ can't find crate

share|improve this question

edited Aug 25 at 14:38

Lukas Kalbertodt

32.3k55 gold badges8181 silver badges146146 bronze badges

asked Oct 15 '14 at 17:47

aveave

4,91355 gold badges1919 silver badges3232 bronze badges

share|improve this question

edited Aug 25 at 14:38

Lukas Kalbertodt

32.3k55 gold badges8181 silver badges146146 bronze badges

asked Oct 15 '14 at 17:47

aveave

4,91355 gold badges1919 silver badges3232 bronze badges

edited Aug 25 at 14:38

Lukas Kalbertodt

32.3k55 gold badges8181 silver badges146146 bronze badges

edited Aug 25 at 14:38

Lukas Kalbertodt

32.3k55 gold badges8181 silver badges146146 bronze badges

asked Oct 15 '14 at 17:47

aveave

4,91355 gold badges1919 silver badges3232 bronze badges

asked Oct 15 '14 at 17:47

aveave

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2 Answers
2

active

oldest

votes

163

You don't need the mod hello in your hello.rs file. Code in any file but the crate root (main.rs for executables, lib.rs for libraries) is automatically namespaced on a module.

To include the code from hello.rs on your main.rs, use mod hello;. It gets expanded to the code that is in hello.rs (exactly as you had before). Your file structure continues the same, and your code needs to be slightly changed:

main.rs:

mod hello;

fn main() 
 hello::print_hello();

hello.rs:

pub fn print_hello() 
 println!("Hello, world!");

share|improve this answer

edited Aug 25 at 14:40

Lukas Kalbertodt

32.3k55 gold badges8181 silver badges146146 bronze badges

answered Oct 15 '14 at 18:57

Renato ZannonRenato Zannon

19.9k66 gold badges2525 silver badges3434 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Late Question wouldn't it also work if I specify it with use hello instead of mod hello?!
  
  – Christian Schmitt
  Sep 16 '15 at 17:23
  

  
  
  
  


• 
  
  
  

  
  6
  

  
  
  
  
  
  

  
  
  @ChristianSchmitt No, they are different things. use is just a namespace thing, while mod pulls in the file. You would use use, for example, to be able to call the print_hello function without having to prefix with the namespace
  
  – Renato Zannon
  Sep 16 '15 at 19:08
  
  

  
  
  
  

add a comment | 

10

You need the mod.rs file in your folder. Rust by Example explains it better.

$ tree .
.
|-- my
| |-- inaccessible.rs
| |-- mod.rs
| |-- nested.rs
`-- split.rs

main.rs

mod my;

fn main() 
 my::function();

mod.rs

pub mod nested; //if you need to include other modules

pub fn function() 
 println!("called `my::function()`");

share|improve this answer

edited Mar 25 '18 at 14:54

Shepmaster

179k2222 gold badges397397 silver badges565565 bronze badges

answered Mar 25 '18 at 13:33

amxaamxa

17133 silver badges44 bronze badges

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Suppose I wanted to use something from inaccessible.rs in nested.rs... how would I do that?
  
  – Heman Gandhi
  Jun 30 at 20:00
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  To access a sibling .rs file from a file other than main.rs, use the path attribute. So, at the top of nested.rs, add the following: #[path = "inaccessible.rs"] and on the next line: mod inaccessible;
  
  – Gardener
  Jul 24 at 11:26
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Gandhi See The path attribute
  
  – Gardener
  Jul 24 at 11:41
  

  
  
  
  

add a comment | 

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163

You don't need the mod hello in your hello.rs file. Code in any file but the crate root (main.rs for executables, lib.rs for libraries) is automatically namespaced on a module.

To include the code from hello.rs on your main.rs, use mod hello;. It gets expanded to the code that is in hello.rs (exactly as you had before). Your file structure continues the same, and your code needs to be slightly changed:

main.rs:

mod hello;

fn main() 
 hello::print_hello();

hello.rs:

pub fn print_hello() 
 println!("Hello, world!");

share|improve this answer

edited Aug 25 at 14:40

Lukas Kalbertodt

32.3k55 gold badges8181 silver badges146146 bronze badges

answered Oct 15 '14 at 18:57

Renato ZannonRenato Zannon

19.9k66 gold badges2525 silver badges3434 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Late Question wouldn't it also work if I specify it with use hello instead of mod hello?!
  
  – Christian Schmitt
  Sep 16 '15 at 17:23
  

  
  
  
  


• 
  
  
  

  
  6
  

  
  
  
  
  
  

  
  
  @ChristianSchmitt No, they are different things. use is just a namespace thing, while mod pulls in the file. You would use use, for example, to be able to call the print_hello function without having to prefix with the namespace
  
  – Renato Zannon
  Sep 16 '15 at 19:08
  
  

  
  
  
  

add a comment | 

163

You don't need the mod hello in your hello.rs file. Code in any file but the crate root (main.rs for executables, lib.rs for libraries) is automatically namespaced on a module.

To include the code from hello.rs on your main.rs, use mod hello;. It gets expanded to the code that is in hello.rs (exactly as you had before). Your file structure continues the same, and your code needs to be slightly changed:

main.rs:

mod hello;

fn main() 
 hello::print_hello();

hello.rs:

pub fn print_hello() 
 println!("Hello, world!");

share|improve this answer

edited Aug 25 at 14:40

Lukas Kalbertodt

32.3k55 gold badges8181 silver badges146146 bronze badges

answered Oct 15 '14 at 18:57

Renato ZannonRenato Zannon

19.9k66 gold badges2525 silver badges3434 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Late Question wouldn't it also work if I specify it with use hello instead of mod hello?!
  
  – Christian Schmitt
  Sep 16 '15 at 17:23
  

  
  
  
  


• 
  
  
  

  
  6
  

  
  
  
  
  
  

  
  
  @ChristianSchmitt No, they are different things. use is just a namespace thing, while mod pulls in the file. You would use use, for example, to be able to call the print_hello function without having to prefix with the namespace
  
  – Renato Zannon
  Sep 16 '15 at 19:08
  
  

  
  
  
  

add a comment | 

You don't need the mod hello in your hello.rs file. Code in any file but the crate root (main.rs for executables, lib.rs for libraries) is automatically namespaced on a module.

To include the code from hello.rs on your main.rs, use mod hello;. It gets expanded to the code that is in hello.rs (exactly as you had before). Your file structure continues the same, and your code needs to be slightly changed:

main.rs:

mod hello;

fn main() 
 hello::print_hello();

hello.rs:

pub fn print_hello() 
 println!("Hello, world!");

share|improve this answer

edited Aug 25 at 14:40

Lukas Kalbertodt

32.3k55 gold badges8181 silver badges146146 bronze badges

answered Oct 15 '14 at 18:57

Renato ZannonRenato Zannon

19.9k66 gold badges2525 silver badges3434 bronze badges

mod hello;

fn main() 
 hello::print_hello();

pub fn print_hello() 
 println!("Hello, world!");

share|improve this answer

edited Aug 25 at 14:40

Lukas Kalbertodt

32.3k55 gold badges8181 silver badges146146 bronze badges

answered Oct 15 '14 at 18:57

Renato ZannonRenato Zannon

19.9k66 gold badges2525 silver badges3434 bronze badges

edited Aug 25 at 14:40

Lukas Kalbertodt

32.3k55 gold badges8181 silver badges146146 bronze badges

edited Aug 25 at 14:40

Lukas Kalbertodt

32.3k55 gold badges8181 silver badges146146 bronze badges

answered Oct 15 '14 at 18:57

Renato ZannonRenato Zannon

19.9k66 gold badges2525 silver badges3434 bronze badges

answered Oct 15 '14 at 18:57

Renato ZannonRenato Zannon

19.9k66 gold badges2525 silver badges3434 bronze badges

10

You need the mod.rs file in your folder. Rust by Example explains it better.

$ tree .
.
|-- my
| |-- inaccessible.rs
| |-- mod.rs
| |-- nested.rs
`-- split.rs

main.rs

mod my;

fn main() 
 my::function();

mod.rs

pub mod nested; //if you need to include other modules

pub fn function() 
 println!("called `my::function()`");

share|improve this answer

edited Mar 25 '18 at 14:54

Shepmaster

179k2222 gold badges397397 silver badges565565 bronze badges

answered Mar 25 '18 at 13:33

amxaamxa

17133 silver badges44 bronze badges

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Suppose I wanted to use something from inaccessible.rs in nested.rs... how would I do that?
  
  – Heman Gandhi
  Jun 30 at 20:00
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  To access a sibling .rs file from a file other than main.rs, use the path attribute. So, at the top of nested.rs, add the following: #[path = "inaccessible.rs"] and on the next line: mod inaccessible;
  
  – Gardener
  Jul 24 at 11:26
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Gandhi See The path attribute
  
  – Gardener
  Jul 24 at 11:41
  

  
  
  
  

add a comment | 

10

You need the mod.rs file in your folder. Rust by Example explains it better.

$ tree .
.
|-- my
| |-- inaccessible.rs
| |-- mod.rs
| |-- nested.rs
`-- split.rs

main.rs

mod my;

fn main() 
 my::function();

mod.rs

pub mod nested; //if you need to include other modules

pub fn function() 
 println!("called `my::function()`");

share|improve this answer

edited Mar 25 '18 at 14:54

Shepmaster

179k2222 gold badges397397 silver badges565565 bronze badges

answered Mar 25 '18 at 13:33

amxaamxa

17133 silver badges44 bronze badges

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Suppose I wanted to use something from inaccessible.rs in nested.rs... how would I do that?
  
  – Heman Gandhi
  Jun 30 at 20:00
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  To access a sibling .rs file from a file other than main.rs, use the path attribute. So, at the top of nested.rs, add the following: #[path = "inaccessible.rs"] and on the next line: mod inaccessible;
  
  – Gardener
  Jul 24 at 11:26
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Gandhi See The path attribute
  
  – Gardener
  Jul 24 at 11:41
  

  
  
  
  

add a comment | 

You need the mod.rs file in your folder. Rust by Example explains it better.

$ tree .
.
|-- my
| |-- inaccessible.rs
| |-- mod.rs
| |-- nested.rs
`-- split.rs

main.rs

mod my;

fn main() 
 my::function();

mod.rs

pub mod nested; //if you need to include other modules

pub fn function() 
 println!("called `my::function()`");

share|improve this answer

edited Mar 25 '18 at 14:54

Shepmaster

179k2222 gold badges397397 silver badges565565 bronze badges

answered Mar 25 '18 at 13:33

amxaamxa

17133 silver badges44 bronze badges

$ tree .
.
|-- my
| |-- inaccessible.rs
| |-- mod.rs
| |-- nested.rs
`-- split.rs

mod my;

fn main() 
 my::function();

pub mod nested; //if you need to include other modules

pub fn function() 
 println!("called `my::function()`");

share|improve this answer

edited Mar 25 '18 at 14:54

Shepmaster

179k2222 gold badges397397 silver badges565565 bronze badges

answered Mar 25 '18 at 13:33

amxaamxa

17133 silver badges44 bronze badges

edited Mar 25 '18 at 14:54

Shepmaster

179k2222 gold badges397397 silver badges565565 bronze badges

edited Mar 25 '18 at 14:54

Shepmaster

179k2222 gold badges397397 silver badges565565 bronze badges

answered Mar 25 '18 at 13:33

amxaamxa

17133 silver badges44 bronze badges

answered Mar 25 '18 at 13:33

amxaamxa

17133 silver badges44 bronze badges