Hi all,
I am new here and new to Rust in general. So far, some of it is simply brilliant.
Other things, I still don’t fully understand.
Let’s start with my most recent issue:
use std::fmt;
use std::string;
struct Abc {}
impl string::ToString for Abc {
}
impl fmt::Display for Abc {
}
fn main() {
println!("Hello World!");
}
I have to admit, I don’t fully understand the module system in general either: it’s not as plain simple as in C, nor as “intelligent” as Python’s or Node’s. Still, it’s something I can get used to.
However, in this case, I suspect std::fmt “imports” the collections crate, which subsequently redefines string::ToString. Bottom line is that this very simple file yields the following error:
error[E0119]: conflicting implementations of trait `std::string::ToString` for type `Abc`:
--> test.rs:6:1
|
6 | impl string::ToString for Abc {
| _^ starting here...
7 | | }
| |_^ ...ending here
|
= note: conflicting implementation in crate `collections`
Usually, the errors that the rust compiler spits out are fairly eloquent. This time, however, it confuses me. I know that it is possible for modules to “export” other modules (by using pub use). However, why would it complain about conflicting implementations? If I remove use std::fmt and the Display trait implementation, it does work.
Anyway, hopefully you can explain to me why it does this so I can get a better understanding of the module system as a whole!
Greetings,
Tim