hulud
4.5.2023
Implementing traits in a separate file
I had a problem implementing trait in a separate file. I had implemented the struct and the trait in my own modules, but when I tried to use the trait's function with the struct I got the following error:
error[E0599]: no method named `next_move` found for struct `Random` in the current scope
-- src/main.rs:12:24
|
12 | game.make_move(eng.next_move(game));
| ^^^^^^^^^ method not found in `Random`
|
::: src/engine/mod.rs:5:8
|
5 | fn next_move(self, game: Game) - ChessMove;
| --------- the method is available for `Random` here
...
8 | pub struct Random { }
| ----------------- method `next_move` not found for this struct
|
= help: items from traits can only be used if the trait is in scope
help: the following trait is implemented but not in scope; perhaps add a `use` for it:
|
1 | use crate::engine::Engine;
|
So the solution was to add use crate::engine::Engine; to main.rs, so that the scope where the function was called knew about the trait