//ww:run-exit 128
package main;
type capture = struct { content: str, start: size, start_bytesize: size, end: size, end_bytesize: size };
export fn main() i32 = {
	let cs: []capture = [];
	append(cs, capture { content = "a", start = 1: size, start_bytesize = 1: size, end = 1: size, end_bytesize = 1: size });
	append(cs, capture { content = "b", start = 2: size, start_bytesize = 2: size, end = 2: size, end_bytesize = 2: size });
	cs[1] = capture { content = "grp", start = 3: size, start_bytesize = 4: size, end = 60: size, end_bytesize = 61: size };
	if (cs[0].start != 1) { return 250; };
	return (cs[1].start + cs[1].start_bytesize + cs[1].end + cs[1].end_bytesize): i32;
};