How do I initialize this array of arrays within a struct?

I'm trying to learn rust from the tutorial. I thought Conway's game of life would be a good place to start.

I'm having trouble understanding how to write this Grid::new() fn.

Here's what I have so far:

enum Cell {
    alive, dead
}
impl Cell {
    fn new() -> Cell {
        alive
    }
struct Grid {
    priv inner: [ [Cell, .. GRID_SIZE], .. GRID_SIZE],
}

impl Grid {
    fn new() {
        Grid { inner: ???? }
    }
}

...

fn main () {
    let grid = Grid::new(); // Stack allocated grid (internal stack allocad array)
}

What I want is for the grid to be initialized with cells all of the value 'alive'.