//ww:run-exit 139
package main;
type capture = struct {
	content: str,
	start: size,
	start_bytesize: size,
	end: size,
	end_bytesize: size,
};
type thr = struct { pc: size, caps: []capture };
export fn main() i32 = {
	let c0: []capture = [];
	append(c0, capture { content = "x", start = 3: size, start_bytesize = 3: size, end = 8: size, end_bytesize = 8: size });
	append(c0, capture { content = "yz", start = 5: size, start_bytesize = 5: size, end = 9: size, end_bytesize = 9: size });
	let ts: []thr = [];
	append(ts, thr { pc = 0: size, caps = c0 });
	let tsp = &ts;
	let dup: []capture = [];
	append(dup, (*tsp)[0].caps...);
	if (len(dup) != 2) { return 1; };
	if (len(dup[1].content) != 2 || dup[1].content[0] != 'y') { return 2; };
	let res: []capture = [];
	append(res, ts[0].caps...);
	if (len(res) != 2) { return 3; };
	if (res[0].end != 8 || res[1].start != 5) { return 4; };
	dup[0].start = 100: size;
	if (ts[0].caps[0].start != 3) { return 5; };
	let acc = dup[0].start + dup[1].end + res[0].start + res[1].end_bytesize
		+ ts[0].caps[0].end + (len(dup): size) * 5;
	return acc: i32;
};