const expect = @import("std").testing.expect;

// Blocks in Zig are expressions and can be given labels, which are used to yield values.
// Here, we are using a label called `blk`.
// Blocks yield values, meaning they can be used in place of a value.
// The value of an empty block `{}` is a value of the type `void`.

test "labelled blocks" {
    const count = blk: {
        var sum: u32 = 0;
        var i: u32 = 0;
        while (i < 10) : (i += 1) sum += i;
        break :blk sum;
    };
    try expect(count == 45);
    try expect(@TypeOf(count) == u32);
}

// This can be seen as being equivalent to C's `i++`.
// blk: {
//     const tmp = i;
//     i += 1;
//     break :blk tmp;
// }