//ww:run-exit 7
package main;
export fn main() i32 = {
	let xs: []str = [];
	let a: str = "abc";
	let b: str = "fg";
	append(xs, a);
	let ys: []str = [];
	append(ys, xs...);
	append(ys, b);
	return (ys[0].len + ys[1].len + ys.len): i32;
};