I suggest you start reading the compiler error messages as they say exactly what trait is missing, no need to waste an hour.

For example for this code:

  trait Foo {
      fn foo(&self) {}
  }

  struct Bar;

  impl Foo for Bar {}

  mod test {
      use super::Bar;
      fn test() {
          Bar.foo();
      }
  }


  22 |         Bar.foo();
     |             ^^^ method not found in `Bar`
     |
     = 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:
     |
  20 |     use crate::Foo;
     |