How does Rust store enum values in arrays?

Question

The following is valid Rust:

enum Foo {
    One(i32, i32, i32),
    Two { x: i32, y: i32 },
}

fn main() {
    let x: [Foo; 2] = [Foo::One(1, 2, 3), Foo::Two         


        

Answer 1

All variants of an enum use the same amount of memory (in case of your Foo type, 16 bytes, at least on my machine). The size of the enum's values is determined by its largest variant (One, in your example).

Therefore, the values can be stored in the array directly.