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struct Clam {
x: Box<isize>,
y: Box<isize>,
}
struct Fish {
a: Box<isize>,
}
fn main() {
let a: Clam = Clam{ x: Box::new(1), y: Box::new(2) };
let b: Clam = Clam{ x: Box::new(10), y: Box::new(20) };
let z: isize = a.x + b.y;
//~^ ERROR cannot add `Box<isize>` to `Box<isize>`
println!("{}", z);
assert_eq!(z, 21);
let forty: Fish = Fish{ a: Box::new(40) };
let two: Fish = Fish{ a: Box::new(2) };
let answer: isize = forty.a + two.a;
//~^ ERROR cannot add `Box<isize>` to `Box<isize>`
println!("{}", answer);
assert_eq!(answer, 42);
}
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