struct Point {
    x i32,
    y i32,
}

pub fn test_struct_create_access() {
    let p = Point { x: 10, y: 20 };
    assert_eq!(p.x, 10);
    assert_eq!(p.y, 20);
}

pub fn test_struct_mut_field() {
    let mut p = Point { x: 1, y: 2 };
    p.x = 100;
    assert_eq!(p.x, 100);
}

pub fn test_struct_destructure() {
    let p = Point { x: 3, y: 4 };
    let Point { x, y } = p;
    assert_eq!(x, 3);
    assert_eq!(y, 4);
}

struct Line {
    start Point,
    end Point,
}

pub fn test_struct_nested() {
    let l = Line {
        start: Point { x: 0, y: 0 },
        end: Point { x: 5, y: 10 },
    };
    assert_eq!(l.start.x, 0);
    assert_eq!(l.end.y, 10);
}

pub fn run_tests() {
    test_struct_create_access();
    test_struct_mut_field();
    test_struct_destructure();
    test_struct_nested();
}