//ww:run
package main;
type pt = struct { a: i64, b: i32 };
type box = struct { v: pt };
fn mk() pt = { return pt { a = 7i64, b = 9i32 }; };
fn main() i32 = {
    let b: box;
    b.v = mk();
    return b.v.b - 9;
};