1const expect = @import("std").testing.expect;
 2
 3test "while error union capture" {
 4    var sum1: u32 = 0;
 5    numbers_left = 3;
 6    while (eventuallyErrorSequence()) |value| {
 7        sum1 += value;
 8    } else |err| {
 9        try expect(err == error.ReachedZero);
10    }
11}
12
13var numbers_left: u32 = undefined;
14
15fn eventuallyErrorSequence() anyerror!u32 {
16    return if (numbers_left == 0) error.ReachedZero else blk: {
17        numbers_left -= 1;
18        break :blk numbers_left;
19    };
20}
21
22// test