tuple.zig

fn Pair(comptime T0: type, comptime T1: type) type {
    return @TypeOf(.{ @as(T0, undefined), @as(T1, undefined) });
}

fn add(p: Pair(i32, i32)) i32 {
    return p[0] + p[1];
}

test "" {
    _ = add;
}

./tuple:6:13: error: use of undefined value here causes undefined behavior
    return p[0] + p[1];
            ^
./tuple:6:17: note: referenced here
    return p[0] + p[1];