rustlings problem

enum3.rs

// enums3.rs
//
// Address all the TODOs to make the tests pass!
//
// Execute `rustlings hint enums3` or use the `hint` watch subcommand for a
// hint.

// I AM NOT DONE

enum Message {
    // TODO: implement the message variant types based on their usage below
    ChangeColor(u8, u8, u8),
    Echo(String),
    Move(Point),
    Quit
}

struct Point {
    x: u8,
    y: u8,
}

struct State {
    color: (u8, u8, u8),
    position: Point,
    quit: bool,
    message: String,
}

impl State {
    fn change_color(&mut self, color: (u8, u8, u8)) {
        self.color = color;
    }

    fn quit(&mut self) {
        self.quit = true;
    }

    fn echo(&mut self, s: String) {
        self.message = s
    }

    fn move_position(&mut self, p: Point) {
        self.position = p;
    }

    fn process(&mut self, message: Message) {
        // TODO: create a match expression to process the different message variants
        // Remember: When passing a tuple as a function argument, you'll need extra parentheses:
        // fn function((t, u, p, l, e))
        match message {
            Message::ChangeColor => self.change_color((message.ChangeColor.0, message.ChangeColor.1, message.ChangeColor.2)),
            Message::Echo => self.echo(Message::Echo),
            Message::Move => self.move_position(Message::Move),
            Message::Quit => self.quit()
        };
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_match_message_call() {
        let mut state = State {
            quit: false,
            position: Point { x: 0, y: 0 },
            color: (0, 0, 0),
            message: "hello world".to_string(),
        };
        state.process(Message::ChangeColor(255, 0, 255));
        state.process(Message::Echo(String::from("Hello world!")));
        state.process(Message::Move(Point { x: 10, y: 15 }));
        state.process(Message::Quit);

        assert_eq!(state.color, (255, 0, 255));
        assert_eq!(state.position.x, 10);
        assert_eq!(state.position.y, 15);
        assert_eq!(state.quit, true);
        assert_eq!(state.message, "Hello world!");
    }
}

enum3_fixed.rs

// enums3.rs
//
// Address all the TODOs to make the tests pass!
//
// Execute `rustlings hint enums3` or use the `hint` watch subcommand for a
// hint.

// I AM NOT DONE

enum Message {
    // TODO: implement the message variant types based on their usage below
    ChangeColor(u8, u8, u8),
    Echo(String),
    Move(Point),
    Quit
}

struct Point {
    x: u8,
    y: u8,
}

struct State {
    color: (u8, u8, u8),
    position: Point,
    quit: bool,
    message: String,
}

impl State {
    fn change_color(&mut self, color: (u8, u8, u8)) {
        self.color = color;
    }

    fn quit(&mut self) {
        self.quit = true;
    }

    fn echo(&mut self, s: String) {
        self.message = s
    }

    fn move_position(&mut self, p: Point) {
        self.position = p;
    }

    fn process(&mut self, message: Message) {
        // TODO: create a match expression to process the different message variants
        // Remember: When passing a tuple as a function argument, you'll need extra parentheses:
        // fn function((t, u, p, l, e))
        match message {
            Message::ChangeColor(r, g, b) => { self.change_color((r, g, b)) },
            Message::Echo(msg) => self.echo(msg),
            Message::Move(p) => self.move_position(p),
            Message::Quit => self.quit()
        };
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_match_message_call() {
        let mut state = State {
            quit: false,
            position: Point { x: 0, y: 0 },
            color: (0, 0, 0),
            message: "hello world".to_string(),
        };
        state.process(Message::ChangeColor(255, 0, 255));
        state.process(Message::Echo(String::from("Hello world!")));
        state.process(Message::Move(Point { x: 10, y: 15 }));
        state.process(Message::Quit);

        assert_eq!(state.color, (255, 0, 255));
        assert_eq!(state.position.x, 10);
        assert_eq!(state.position.y, 15);
        assert_eq!(state.quit, true);
        assert_eq!(state.message, "Hello world!");
    }
}

error.log

⚠️  Compiling of exercises/08_enums/enums3.rs failed! Please try again. Here's the output:
error[E0532]: expected unit struct, unit variant or constant, found tuple variant `Message::ChangeColor`
  --> exercises/08_enums/enums3.rs:52:13
   |
12 |     ChangeColor(u8, u8, u8),
   |     ----------------------- `Message::ChangeColor` defined here
...
52 |             Message::ChangeColor => self.change_color((message.ChangeColor.0, message.ChangeColor.1, message.ChangeColor.2)),
   |             ^^^^^^^^^^^^^^^^^^^^ help: use the tuple variant pattern syntax instead: `Message::ChangeColor(_, _, _)`

error[E0532]: expected unit struct, unit variant or constant, found tuple variant `Message::Echo`
  --> exercises/08_enums/enums3.rs:53:13
   |
13 |     Echo(String),
   |     ------------ `Message::Echo` defined here
...
53 |             Message::Echo => self.echo(Message::Echo),
   |             ^^^^^^^^^^^^^ help: use the tuple variant pattern syntax instead: `Message::Echo(_)`

error[E0532]: expected unit struct, unit variant or constant, found tuple variant `Message::Move`
  --> exercises/08_enums/enums3.rs:54:13
   |
14 |     Move(Point),
   |     ----------- `Message::Move` defined here
...
54 |             Message::Move => self.move_position(Message::Move),
   |             ^^^^^^^^^^^^^ help: use the tuple variant pattern syntax instead: `Message::Move(_)`

error[E0609]: no field `ChangeColor` on type `Message`
  --> exercises/08_enums/enums3.rs:52:64
   |
52 |             Message::ChangeColor => self.change_color((message.ChangeColor.0, message.ChangeColor.1, message.ChangeColor.2)),
   |                                                                ^^^^^^^^^^^

error[E0609]: no field `ChangeColor` on type `Message`
  --> exercises/08_enums/enums3.rs:52:87
   |
52 |             Message::ChangeColor => self.change_color((message.ChangeColor.0, message.ChangeColor.1, message.ChangeColor.2)),
   |                                                                                       ^^^^^^^^^^^

error[E0609]: no field `ChangeColor` on type `Message`
  --> exercises/08_enums/enums3.rs:52:110
   |
52 |             Message::ChangeColor => self.change_color((message.ChangeColor.0, message.ChangeColor.1, message.ChangeColor.2)),
   |                                                                                                              ^^^^^^^^^^^

error[E0308]: mismatched types
  --> exercises/08_enums/enums3.rs:53:40
   |
53 |             Message::Echo => self.echo(Message::Echo),
   |                                   ---- ^^^^^^^^^^^^^ expected `String`, found enum constructor
   |                                   |
   |                                   arguments to this method are incorrect
   |
   = note:        expected struct `String`
           found enum constructor `fn(String) -> Message {Message::Echo}`
note: method defined here
  --> exercises/08_enums/enums3.rs:39:8
   |
39 |     fn echo(&mut self, s: String) {
   |        ^^^^            ---------

error[E0308]: mismatched types
  --> exercises/08_enums/enums3.rs:54:49
   |
54 |             Message::Move => self.move_position(Message::Move),
   |                                   ------------- ^^^^^^^^^^^^^ expected `Point`, found enum constructor
   |                                   |
   |                                   arguments to this method are incorrect
   |
   = note:        expected struct `Point`
           found enum constructor `fn(Point) -> Message {Message::Move}`
note: method defined here
  --> exercises/08_enums/enums3.rs:43:8
   |
43 |     fn move_position(&mut self, p: Point) {
   |        ^^^^^^^^^^^^^            --------

error: aborting due to 8 previous errors

Some errors have detailed explanations: E0308, E0532, E0609.
For more information about an error, try `rustc --explain E0308`.