3.1 Structures - incorrectly assigns coordinates to Points in Rectangle

[t-sua]

Hello, I'm currently going through "Rust by Example" and I'm very grateful for it, thank you. I was doing the activity which says to create a rect_area function to calculate the area of a Rectangle. When I completed this I noticed that I was getting a negative result when using my function on the already-created Rectangle in the default code. I found out that this is because the _rectangle.top_left.x coordinate is actually further right than the _rectangle.bottom_right.x coordinate, which is wrong-- bottom_right should have the right-most x value.

// Instantiate a `Point`
let point: Point = Point { x: 10.3, y: 0.4 };
let another_point: Point = Point { x: 5.2, y: 0.2 };

// Make a new point by using struct update syntax to use the fields of our
// other one
let bottom_right = Point { x: 5.2, ..another_point };

// Destructure the point using a `let` binding
let Point { x: left_edge, y: top_edge } = point;

let _rectangle = Rectangle {
   // struct instantiation is an expression too
  top_left: Point { x: left_edge, y: top_edge },
  bottom_right: bottom_right,
};

I've removed irrelevant code, but notice how the bottom_right of _rectangle is actually on the bottom left, and the top_left is actually on the top right!

Finding the area of a rectangle with these coordinates (if one goes by the names of the fields) would be (x2-x1)* (y2-y1) would yield a negative result! This can all be fixed by swapping the initial x values given on lines 50 and 51, and then also correcting the x value given on line 58.

It should be like this:

// Instantiate a `Point`
    let point: Point = Point { x: 5.2, y: 0.4 };
    let another_point: Point = Point { x: 10.3, y: 0.2 };
//...
//...
//...
    let bottom_right = Point { x: 10.3, ..another_point };

Thank you for your attention to this matter.

[t-sua]

I have made these corrections and issued a PR for these changes here: #1884

Thank you