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use struct_here::MyStruct;
//use trait_here::MyTrait; // rustc suggest that, IntelliJ inserts automatically
 
mod struct_here {
    pub struct MyStruct;
 
    impl MyStruct {}
}
 
mod trait_here {
    use struct_here::MyStruct;
 
    pub trait MyTrait {
        fn print_hello(&self);
    }
 
    impl MyTrait for MyStruct {
        fn print_hello(&self) {
            println!("Hello, World!")
        }
    }
}
 
fn main() {
    let instance = MyStruct {};
    instance.print_hello(); // <- situation: I'm writing this line of code
}
 

error: no method named `print_hello` found for type `struct_here::MyStruct` in the current scope
  --> prog.rs:26:14
   |
26 |     instance.print_hello(); // <- situation: I'm writing this line of code
   |              ^^^^^^^^^^^
   |
   = help: items from traits can only be used if the trait is in scope; the following trait is implemented but not in scope, perhaps add a `use` for it:
   = help: candidate #1: `use trait_here::MyTrait`

error: aborting due to previous error

Standard output is empty