[Solved]Using modules in Rust 2018

#1

Please consider the following structure:

.
├── Cargo.lock
├── Cargo.toml
└── src
    ├── main.rs
    └── mod1
        ├── bar.rs
        └── mod.rs

The content of files:

// mod1/bar.rs
pub fn pp() {
    println!("Print from bar");
}

// mod1/mod.rs
mod bar;

pub use self::bar::*;

// main.rs
mod mod1;

fn main() {
    mod1::pp();
}

# Cargo.toml
[package]
name = "test-2018"
version = "0.1.0"
edition = "2018"

Running cargo run raises the following error:

error[E0658]: imports can only refer to extern crate names passed with `--extern` on stable channel (see issue #53130)                                                 
 --> src/mod1/mod.rs:3:9                                                                                                                                               
  |                                                                                                                                                                    
1 | mod bar;                                                                                                                                                           
  | -------- not an extern crate passed with `--extern`                                                                                                                
2 |                                                                                                                                                                    
3 | pub use self::bar::*;                                                                                                                                                    
  |         ^^^                                                                                                                                                        
  |                                                                                                                                                                    
note: this import refers to the module defined here                                                                                                                    
 --> src/mod1/mod.rs:1:1                                                                                                                                               
  |                                                                                                                                                                    
1 | mod bar;                                                                                                                                                           
  | ^^^^^^^^                                                                                                                                                           
                                                                                                                                                                       
error: aborting due to previous error                                                                                                                                  
                                                                                                                                                                       
For more information about this error, try `rustc --explain E0658`.                                                                                                    
error: Could not compile `test-2018`.                                                                                                                                  

To learn more, run the command again with --verbose.

I tried cargo fix with no success and got the same error as cargo run

I forgot to add self and now it is working fine.

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